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  "owner_pack": "core.metrology",
  "status": "preview",
  "scope": "Common definitions selected from existing calculator and converter unit requirements. Discovery coverage is separate from execution support, model compatibility and CVP verification.",
  "sources": [
    {
      "id": "source:bipm-si-9-v4.01",
      "publisher": "BIPM",
      "title": "The International System of Units (SI)",
      "url": "https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf/2d2b50bf-f2b4-9661-f402-5f9d66e4b507?download=true&t=1780410776583&version=7.0",
      "edition": "9th edition, version 4.01, June 2026",
      "checked_at": "2026-10-29",
      "reuse_note": "Definition metadata attributed to BIPM; brochure licensed CC BY 4.0."
    },
    {
      "id": "source:nist-foot",
      "publisher": "NIST",
      "title": "U.S. Survey Foot: Revised Unit Conversion Factors",
      "url": "https://www.nist.gov/pml/us-surveyfoot/revised-unit-conversion-factors",
      "edition": "Web table accessed 2026-10-28",
      "checked_at": "2026-10-29",
      "reuse_note": "References factual unit definitions; source text and media are not redistributed."
    },
    {
      "id": "source:nist-sp811-b8",
      "publisher": "NIST",
      "title": "NIST Guide to the SI, Appendix B.8",
      "url": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8",
      "edition": "SP 811 online conversion table accessed 2026-10-28",
      "checked_at": "2026-10-29",
      "reuse_note": "Exact definition is distinguished from rounded table entries; no media copied."
    },
    {
      "id": "source:nist-temperature",
      "publisher": "NIST",
      "title": "SI Units — Temperature",
      "url": "https://www.nist.gov/pml/owm/si-units-temperature",
      "edition": "Web conversion table accessed 2026-10-28",
      "checked_at": "2026-10-28",
      "reuse_note": "References the exact temperature conversion table and interval relationship; no media copied."
    },
    {
      "id": "source:noaa-foot",
      "publisher": "NOAA",
      "title": "A Tale of Two Feet",
      "url": "https://oceanservice.noaa.gov/geodesy/international-foot.html",
      "edition": "Web definition accessed 2026-10-29",
      "checked_at": "2026-10-29",
      "reuse_note": "Factual definition metadata with attribution; no source text, images or private validation assets redistributed."
    },
    {
      "id": "source:nist-pound",
      "publisher": "NIST",
      "title": "Mass Calibrations, SP 250-31",
      "url": "https://www.nist.gov/system/files/documents/calibrations/sp250-31.pdf",
      "edition": "SP 250-31, mass unit definition",
      "checked_at": "2026-10-29",
      "reuse_note": "Factual definition metadata with attribution; no source text, images or private validation assets redistributed."
    },
    {
      "id": "source:sedris-gon",
      "publisher": "SEDRIS",
      "title": "EDCS unit of measure GON",
      "url": "https://edcsreg.sedris.org/browse/eu/GON/",
      "edition": "EDCS registry unit GON, accessed 2026-10-29",
      "checked_at": "2026-10-29",
      "reuse_note": "Factual definition metadata with attribution; no source text, images or private validation assets redistributed."
    },
    {
      "id": "source:nist-hb44-2026",
      "publisher": "NIST",
      "title": "Handbook 44 — Appendix C, General Tables of Units of Measurement",
      "url": "https://www.nist.gov/document/2026-nist-handbook-44-appendix-c",
      "edition": "2026 edition; Appendix C",
      "checked_at": "2026-10-29",
      "reuse_note": "Factual definition relationships are independently encoded; no source prose or media redistributed."
    },
    {
      "id": "source:uk-unit-definitions-1994",
      "publisher": "UK legislation",
      "title": "Weights and Measures Act 1985 — Schedule 1, unit definitions",
      "url": "https://www.legislation.gov.uk/ukpga/1985/72/schedule/1/2026-10-14",
      "edition": "Schedule 1, snapshot 2026-10-14; factual unit definitions only",
      "checked_at": "2026-10-29",
      "reuse_note": "Factual definition relationships are independently encoded; no source prose or media redistributed."
    },
    {
      "id": "source:nbs-heating-values-1982",
      "publisher": "NBS (now NIST)",
      "title": "Heating Values of Natural Gas and Its Components",
      "url": "https://nvlpubs.nist.gov/nistpubs/Legacy/IR/nbsir81-2401.pdf",
      "edition": "NBSIR 82-2401, August 1982, Appendix A3.2.2",
      "checked_at": "2026-10-29",
      "reuse_note": "Factual definition relationships are independently encoded; no source prose or media redistributed."
    },
    {
      "id": "source:nist-binary-prefixes",
      "publisher": "NIST",
      "title": "Prefixes for binary multiples",
      "url": "https://physics.nist.gov/cuu/Units/binary.html",
      "edition": "IEC binary multiples and SI comparisons; web reference",
      "checked_at": "2026-10-29",
      "reuse_note": "Factual definition relationships are independently encoded; no source prose or media redistributed."
    }
  ],
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    },
    {
      "id": "heat_transfer_coefficient",
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    {
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        "Electrical"
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    },
    {
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    },
    {
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    },
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        2,
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    },
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        3,
        2,
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    },
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    },
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    },
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    {
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        "Physics"
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    },
    {
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        0,
        0
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      "roles": [
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        "Mechanical"
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    },
    {
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        -3,
        0,
        0,
        0,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Optics",
        "Thermal"
      ]
    },
    {
      "id": "luminance",
      "label": "Luminance",
      "dimension": [
        -2,
        0,
        0,
        0,
        0,
        0,
        1
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Optics"
      ]
    },
    {
      "id": "radioactivity",
      "label": "Activity",
      "dimension": [
        0,
        0,
        -1,
        0,
        0,
        0,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Physics"
      ]
    },
    {
      "id": "absorbed_dose",
      "label": "Absorbed dose",
      "dimension": [
        2,
        0,
        -2,
        0,
        0,
        0,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Physics"
      ]
    },
    {
      "id": "dose_equivalent",
      "label": "Dose equivalent",
      "dimension": [
        2,
        0,
        -2,
        0,
        0,
        0,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Physics"
      ]
    },
    {
      "id": "catalytic_activity",
      "label": "Catalytic activity",
      "dimension": [
        0,
        0,
        -1,
        0,
        0,
        1,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Chemistry"
      ]
    },
    {
      "id": "information",
      "label": "Information quantity",
      "dimension": [
        0,
        0,
        0,
        0,
        0,
        0,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Computing"
      ]
    },
    {
      "id": "information_rate",
      "label": "Information rate",
      "dimension": [
        0,
        0,
        -1,
        0,
        0,
        0,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Computing"
      ]
    },
    {
      "id": "inverse_time",
      "label": "Inverse time",
      "dimension": [
        0,
        0,
        -1,
        0,
        0,
        0,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Physics",
        "Chemistry"
      ]
    },
    {
      "id": "voltage_temperature_coefficient",
      "label": "Voltage temperature coefficient",
      "dimension": [
        2,
        1,
        -3,
        -1,
        -1,
        0,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Electrical"
      ]
    },
    {
      "id": "transconductance_parameter",
      "label": "Transconductance parameter",
      "dimension": [
        -4,
        -2,
        6,
        3,
        0,
        0,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Electrical"
      ]
    },
    {
      "id": "resistance_per_length",
      "label": "Resistance per length",
      "dimension": [
        1,
        1,
        -3,
        -2,
        0,
        0,
        0
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Electrical"
      ]
    },
    {
      "id": "luminous_efficacy",
      "label": "Luminous efficacy",
      "dimension": [
        -2,
        -1,
        3,
        0,
        0,
        0,
        1
      ],
      "roles": [
        "scalar"
      ],
      "domains": [
        "Optics",
        "Electrical"
      ]
    }
  ],
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    {
      "unit_id": "cx:m",
      "slug": "metre",
      "name": "Metre",
      "symbol": "m",
      "code": "m",
      "aliases": [
        "meter",
        "metres",
        "meters"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
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        "type": "reference",
        "reference_unit": "cx:m",
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          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
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        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 2.3.1, SI base units"
        }
      ],
      "scope": "Definition metadata only; use an existing converter where linked.",
      "legacy_tools": [
        {
          "label": "Metres to feet",
          "href": "/convert/length/meter-to-feet",
          "role": "scalar"
        }
      ],
      "usage_status": "current",
      "family_id": "length.m",
      "systems": [
        "si_coherent"
      ]
    },
    {
      "unit_id": "cx:cm",
      "slug": "centimetre",
      "name": "Centimetre",
      "symbol": "cm",
      "code": "cm",
      "aliases": [
        "centimeter"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
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        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "1",
          "denominator": "100"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
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        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 3, Table 7: centi prefix applied to metre"
        }
      ],
      "scope": "Definition metadata only; use an existing converter where linked.",
      "legacy_tools": [
        {
          "label": "Centimetres to millimetres",
          "href": "/convert/length/cm-to-mm",
          "role": "scalar"
        }
      ],
      "usage_status": "current",
      "family_id": "length.m",
      "systems": [
        "si_decimal"
      ]
    },
    {
      "unit_id": "cx:mm",
      "slug": "millimetre",
      "name": "Millimetre",
      "symbol": "mm",
      "code": "mm",
      "aliases": [
        "millimeter"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
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      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
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          "numerator": "1",
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        },
        "offset": {
          "numerator": "0",
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        }
      },
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        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 3, Table 7: milli prefix applied to metre"
        }
      ],
      "scope": "Definition metadata only; use an existing converter where linked.",
      "legacy_tools": [
        {
          "label": "Millimetres to centimetres",
          "href": "/convert/length/mm-to-cm",
          "role": "scalar"
        }
      ],
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      "family_id": "length.m",
      "systems": [
        "si_decimal"
      ]
    },
    {
      "unit_id": "cx:ft_i",
      "slug": "international-foot",
      "name": "International foot",
      "symbol": "ft",
      "code": "ft_i",
      "aliases": [
        "foot",
        "feet",
        "ft"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "381",
          "denominator": "1250"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-foot",
          "locator": "Conversion table, foot row, exact international-foot column"
        }
      ],
      "scope": "International foot only. The historical U.S. survey foot is a different definition; an unqualified ambiguous foot must not be silently resolved.",
      "legacy_tools": [
        {
          "label": "Feet to metres",
          "href": "/convert/length/feet-to-meter",
          "role": "scalar"
        }
      ],
      "usage_status": "current",
      "family_id": "length.m",
      "systems": [
        "international_yard_pound"
      ]
    },
    {
      "unit_id": "cx:in_i",
      "slug": "international-inch",
      "name": "International inch",
      "symbol": "in",
      "code": "in_i",
      "aliases": [
        "inch",
        "inches",
        "in"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "127",
          "denominator": "5000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8, I: inch to metre (exact factor)"
        }
      ],
      "scope": "International inch; historical or regional definitions are not inferred.",
      "legacy_tools": [
        {
          "label": "Inches to metres",
          "href": "/convert/length/inch-to-meter",
          "role": "scalar"
        }
      ],
      "usage_status": "current",
      "family_id": "length.m",
      "systems": [
        "international_yard_pound"
      ]
    },
    {
      "unit_id": "cx:kg",
      "slug": "kilogram",
      "name": "Kilogram",
      "symbol": "kg",
      "code": "kg",
      "aliases": [
        "kilograms"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 2.3.1, SI base units"
        }
      ],
      "scope": "Definition metadata only; use an existing converter where linked.",
      "legacy_tools": [
        {
          "label": "Kilograms to grams",
          "href": "/convert/weight/kg-to-gram",
          "role": "scalar"
        }
      ],
      "usage_status": "current",
      "family_id": "mass.kg",
      "systems": [
        "si_coherent"
      ]
    },
    {
      "unit_id": "cx:g",
      "slug": "gram",
      "name": "Gram",
      "symbol": "g",
      "code": "g",
      "aliases": [
        "grams"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 3: mass prefixes are applied to gram, not kilogram"
        }
      ],
      "scope": "Definition metadata only; use an existing converter where linked.",
      "legacy_tools": [
        {
          "label": "Grams to kilograms",
          "href": "/convert/weight/gram-to-kg",
          "role": "scalar"
        }
      ],
      "usage_status": "current",
      "family_id": "mass.kg",
      "systems": [
        "si_decimal"
      ]
    },
    {
      "unit_id": "cx:s",
      "slug": "second",
      "name": "Second",
      "symbol": "s",
      "code": "s",
      "aliases": [
        "seconds",
        "sec",
        "second"
      ],
      "quantity_kind": "duration",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:s",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 2.3.1, SI base units"
        }
      ],
      "scope": "Elapsed time, not calendar dates, time zones or leap-second conversion.",
      "legacy_tools": [],
      "usage_status": "current",
      "family_id": "duration.s",
      "systems": [
        "si_coherent"
      ]
    },
    {
      "unit_id": "cx:min",
      "slug": "minute",
      "name": "Minute",
      "symbol": "min",
      "code": "min",
      "aliases": [
        "minutes",
        "minute"
      ],
      "quantity_kind": "duration",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:s",
        "scale": {
          "numerator": "60",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 4, Table 8: minute"
        }
      ],
      "scope": "Exactly 60 seconds of elapsed time; not an angular minute.",
      "legacy_tools": [],
      "usage_status": "current",
      "family_id": "duration.s",
      "systems": [
        "si_accepted"
      ]
    },
    {
      "unit_id": "cx:h",
      "slug": "hour",
      "name": "Hour",
      "symbol": "h",
      "code": "h",
      "aliases": [
        "hours",
        "hr"
      ],
      "quantity_kind": "duration",
      "owner_pack": "core.metrology",
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      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:s",
        "scale": {
          "numerator": "3600",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
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        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 4, Table 8: hour"
        }
      ],
      "scope": "Exactly 3600 seconds of elapsed time; not civil-time or calendar arithmetic.",
      "legacy_tools": [],
      "usage_status": "current",
      "family_id": "duration.s",
      "systems": [
        "si_accepted"
      ]
    },
    {
      "unit_id": "cx:K",
      "slug": "kelvin",
      "name": "Kelvin",
      "symbol": "K",
      "code": "K",
      "aliases": [
        "kelvins"
      ],
      "quantity_kind": "temperature",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:K",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 2.3.1, SI base units"
        }
      ],
      "scope": "Point and interval roles are distinct. Ordinary thermodynamic temperature points must not be below absolute zero.",
      "legacy_tools": [
        {
          "label": "Kelvin to Celsius values",
          "href": "/convert/temperature/kelvin-to-celsius",
          "role": "point"
        }
      ],
      "usage_status": "current",
      "family_id": "temperature.k",
      "systems": [
        "si_coherent"
      ]
    },
    {
      "unit_id": "cx:degC",
      "slug": "degree-celsius",
      "name": "Degree Celsius",
      "symbol": "°C",
      "code": "degC",
      "aliases": [
        "Celsius",
        "celsius",
        "degC"
      ],
      "quantity_kind": "temperature",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "affine",
        "reference_unit": "cx:K",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "5463",
          "denominator": "20"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-temperature",
          "locator": "Temperature Conversion (Exact), Celsius to Kelvin; interval explanation"
        }
      ],
      "scope": "Temperature points use the offset. Temperature differences use slope only. Linked legacy tools handle points, not intervals.",
      "legacy_tools": [
        {
          "label": "Celsius to Kelvin values",
          "href": "/convert/temperature/celsius-to-kelvin",
          "role": "point"
        }
      ],
      "usage_status": "current",
      "family_id": "temperature.k",
      "systems": [
        "si_coherent"
      ]
    },
    {
      "unit_id": "cx:degF",
      "slug": "degree-fahrenheit",
      "name": "Degree Fahrenheit",
      "symbol": "°F",
      "code": "degF",
      "aliases": [
        "Fahrenheit",
        "fahrenheit",
        "degF"
      ],
      "quantity_kind": "temperature",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "affine",
        "reference_unit": "cx:K",
        "scale": {
          "numerator": "5",
          "denominator": "9"
        },
        "offset": {
          "numerator": "45967",
          "denominator": "180"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-temperature",
          "locator": "Temperature Conversion (Exact), Fahrenheit to Kelvin; interval explanation"
        }
      ],
      "scope": "Temperature points use scale and offset. Differences use only 5/9; the linked legacy converter handles points.",
      "legacy_tools": [
        {
          "label": "Fahrenheit to Celsius values",
          "href": "/convert/temperature/fahrenheit-to-celsius",
          "role": "point"
        }
      ],
      "usage_status": "current",
      "family_id": "temperature.k",
      "systems": [
        "us_customary"
      ]
    },
    {
      "unit_id": "cx:m3",
      "slug": "cubic-metre",
      "name": "Cubic metre",
      "symbol": "m³",
      "code": "m3",
      "aliases": [
        "cubic meter",
        "m^3",
        "m3"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.1.1",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 2.3.4, Table 4: coherent derived unit for volume"
        }
      ],
      "scope": "Definition metadata only; use an existing converter where linked.",
      "legacy_tools": [],
      "expression": {
        "cx:m": 3
      },
      "usage_status": "current",
      "family_id": "volume.m3",
      "systems": [
        "si_coherent"
      ],
      "applicable_quantity_kinds": [
        "volume",
        "section_modulus"
      ]
    },
    {
      "unit_id": "cx:L",
      "slug": "litre",
      "name": "Litre",
      "symbol": "L",
      "code": "L",
      "aliases": [
        "liter",
        "litres",
        "liters",
        "l"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 4, Table 8: litre"
        }
      ],
      "scope": "Volume expression. Mass-to-volume conversion needs a separate density model.",
      "legacy_tools": [],
      "usage_status": "current",
      "family_id": "volume.m3",
      "systems": [
        "si_accepted"
      ]
    },
    {
      "unit_id": "cx:mL",
      "slug": "millilitre",
      "name": "Millilitre",
      "symbol": "mL",
      "code": "mL",
      "aliases": [
        "milliliter",
        "ml"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.1.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:L",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 3, Table 7: milli prefix; Section 4, Table 8: litre"
        }
      ],
      "scope": "Volume expression derived from litre using the milli prefix; no density or substance is inferred.",
      "legacy_tools": [],
      "usage_status": "current",
      "family_id": "volume.m3",
      "systems": [
        "si_accepted"
      ]
    },
    {
      "unit_id": "cx:km",
      "slug": "kilometre",
      "name": "Kilometre",
      "symbol": "km",
      "code": "km",
      "aliases": [
        "km",
        "kilometer"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "length.m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:um",
      "slug": "micrometre",
      "name": "Micrometre",
      "symbol": "µm",
      "code": "um",
      "aliases": [
        "um",
        "micrometer",
        "μm"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "1",
          "denominator": "1000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "length.m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:nm",
      "slug": "nanometre",
      "name": "Nanometre",
      "symbol": "nm",
      "code": "nm",
      "aliases": [
        "nm",
        "nanometer"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "1",
          "denominator": "1000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "length.m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:yd_i",
      "slug": "international-yard",
      "name": "International yard",
      "symbol": "yd",
      "code": "yd_i",
      "aliases": [
        "yard",
        "yards"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "1143",
          "denominator": "1250"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Yard: 1 yd = 3 international feet = 0.9144 m exactly"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "international_yard_pound"
      ],
      "family_id": "length.m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:mi_i",
      "slug": "international-mile",
      "name": "International mile",
      "symbol": "mi",
      "code": "mi_i",
      "aliases": [
        "mile",
        "miles",
        "statute mile"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "201168",
          "denominator": "125"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-foot",
          "locator": "International-foot table: mile = 5280 ft = 1609.344 m exactly"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "international_yard_pound"
      ],
      "family_id": "length.m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:ft_us",
      "slug": "us-survey-foot",
      "name": "U.S. survey foot",
      "symbol": "ft",
      "code": "ft_us",
      "aliases": [
        "foot",
        "feet",
        "survey foot"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "1200",
          "denominator": "3937"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:noaa-foot",
          "locator": "Exact U.S. survey foot relationship 1200/3937 m"
        }
      ],
      "scope": "Historical U.S. survey foot. Distinct from the international foot; retain for legacy data. No existing international-foot tool is linked.",
      "legacy_tools": [],
      "systems": [
        "historical_us_survey"
      ],
      "family_id": "length.m",
      "usage_status": "historical"
    },
    {
      "unit_id": "cx:mg",
      "slug": "milligram",
      "name": "Milligram",
      "symbol": "mg",
      "code": "mg",
      "aliases": [
        "mg"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "1",
          "denominator": "1000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "mass.kg",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:ug",
      "slug": "microgram",
      "name": "Microgram",
      "symbol": "µg",
      "code": "ug",
      "aliases": [
        "ug",
        "μg"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "1",
          "denominator": "1000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "mass.kg",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:t",
      "slug": "tonne",
      "name": "Tonne",
      "symbol": "t",
      "code": "t",
      "aliases": [
        "metric ton"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "mass.kg",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:lb_av",
      "slug": "avoirdupois-pound",
      "name": "Avoirdupois pound",
      "symbol": "lb",
      "code": "lb_av",
      "aliases": [
        "pound",
        "pounds",
        "lbs"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "45359237",
          "denominator": "100000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-pound",
          "locator": "Introduction: avoirdupois pound equals 0.45359237 kilogram"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "international_yard_pound"
      ],
      "family_id": "mass.kg",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:ms",
      "slug": "millisecond",
      "name": "Millisecond",
      "symbol": "ms",
      "code": "ms",
      "aliases": [
        "millisecond"
      ],
      "quantity_kind": "duration",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:s",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 7 prefixes; Table 8: day = 24 h = 86400 s"
        }
      ],
      "scope": "Elapsed duration only. A calendar day across time-zone or daylight-saving transitions is a different operation.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "duration.s",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:us",
      "slug": "microsecond",
      "name": "Microsecond",
      "symbol": "µs",
      "code": "us",
      "aliases": [
        "microsecond",
        "μs",
        "us"
      ],
      "quantity_kind": "duration",
      "owner_pack": "core.metrology",
      "revision": "1.0.1",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:s",
        "scale": {
          "numerator": "1",
          "denominator": "1000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 7 prefixes; Table 8: day = 24 h = 86400 s"
        }
      ],
      "scope": "Elapsed duration only. A calendar day across time-zone or daylight-saving transitions is a different operation.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "duration.s",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:d",
      "slug": "day",
      "name": "Day",
      "symbol": "d",
      "code": "d",
      "aliases": [
        "day"
      ],
      "quantity_kind": "duration",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:s",
        "scale": {
          "numerator": "86400",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 7 prefixes; Table 8: day = 24 h = 86400 s"
        }
      ],
      "scope": "Elapsed duration only. A calendar day across time-zone or daylight-saving transitions is a different operation.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "duration.s",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:degR",
      "slug": "degree-rankine",
      "name": "Degree Rankine",
      "symbol": "°R",
      "code": "degR",
      "aliases": [
        "rankine"
      ],
      "quantity_kind": "temperature",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:K",
        "scale": {
          "numerator": "5",
          "denominator": "9"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Degree Rankine: T/K = (T/°R)/1.8; intervals use the same slope"
        }
      ],
      "scope": "Point and interval roles are distinct. Rankine points share the absolute zero of Kelvin.",
      "legacy_tools": [],
      "systems": [
        "us_customary"
      ],
      "family_id": "temperature.k",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:rad",
      "slug": "radian",
      "name": "Radian",
      "symbol": "rad",
      "code": "rad",
      "aliases": [
        "radians"
      ],
      "quantity_kind": "plane_angle",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:rad",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Plane angle, not a generic ratio, solid angle, or frequency. No implicit wrap or principal-angle reduction.",
      "legacy_tools": [
        {
          "label": "Radians to degrees",
          "href": "/convert/number/radians-to-degrees",
          "role": "scalar"
        }
      ],
      "systems": [
        "si_coherent"
      ],
      "family_id": "plane_angle.rad",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:deg",
      "slug": "degree",
      "name": "Degree",
      "symbol": "°",
      "code": "deg",
      "aliases": [
        "degree",
        "degrees",
        "deg"
      ],
      "quantity_kind": "plane_angle",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:rad",
        "scale": {
          "numerator": "1",
          "denominator": "180",
          "pi_power": 1
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8: degree = (pi/180) rad exactly"
        }
      ],
      "scope": "Plane angle. Distinct from temperature degree symbols; exact pi coefficient, not a rounded decimal conversion.",
      "legacy_tools": [
        {
          "label": "Degrees to radians",
          "href": "/convert/number/degrees-to-radians",
          "role": "scalar"
        }
      ],
      "systems": [
        "si_accepted"
      ],
      "family_id": "plane_angle.rad",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:arcmin",
      "slug": "arcminute",
      "name": "Arcminute",
      "symbol": "′",
      "code": "arcmin",
      "aliases": [
        "arc minute",
        "minute of arc",
        "minute"
      ],
      "quantity_kind": "plane_angle",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:rad",
        "scale": {
          "numerator": "1",
          "denominator": "10800",
          "pi_power": 1
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8: minute of plane angle = degree/60"
        }
      ],
      "scope": "Minute of plane angle, not an elapsed time minute. Resolve the quantity kind explicitly.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "plane_angle.rad",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:arcsec",
      "slug": "arcsecond",
      "name": "Arcsecond",
      "symbol": "″",
      "code": "arcsec",
      "aliases": [
        "arc second",
        "second of arc",
        "second"
      ],
      "quantity_kind": "plane_angle",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:rad",
        "scale": {
          "numerator": "1",
          "denominator": "648000",
          "pi_power": 1
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8: second of plane angle = minute/60"
        }
      ],
      "scope": "Second of plane angle, not an elapsed time second.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "plane_angle.rad",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:turn",
      "slug": "turn",
      "name": "Turn",
      "symbol": "turn",
      "code": "turn",
      "aliases": [
        "revolution",
        "rev",
        "full turn",
        "turns"
      ],
      "quantity_kind": "plane_angle",
      "owner_pack": "core.metrology",
      "revision": "1.0.1",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:rad",
        "scale": {
          "numerator": "2",
          "denominator": "1",
          "pi_power": 1
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 4 note on radian: full circle is 2 pi rad"
        }
      ],
      "scope": "One complete plane rotation = 2 pi rad; no automatic modulo reduction.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "plane_angle.rad",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:gon",
      "slug": "gon",
      "name": "Gon",
      "symbol": "gon",
      "code": "gon",
      "aliases": [
        "grad",
        "gradian",
        "gons"
      ],
      "quantity_kind": "plane_angle",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:rad",
        "scale": {
          "numerator": "1",
          "denominator": "200",
          "pi_power": 1
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:sedris-gon",
          "locator": "EDCS EU GON: 1 gon = pi/200 rad"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "plane_angle.rad",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:mrad",
      "slug": "milliradian",
      "name": "Milliradian",
      "symbol": "mrad",
      "code": "mrad",
      "aliases": [
        "milliradians"
      ],
      "quantity_kind": "plane_angle",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:rad",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "plane_angle.rad",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:sr",
      "slug": "steradian",
      "name": "Steradian",
      "symbol": "sr",
      "code": "sr",
      "aliases": [
        "steradians"
      ],
      "quantity_kind": "solid_angle",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:sr",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Solid angle; not interchangeable with plane angle or a generic ratio despite SI dimension one.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "solid_angle.sr",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:one",
      "slug": "one",
      "name": "One",
      "symbol": "1",
      "code": "one",
      "aliases": [
        "unitless",
        "dimensionless ratio"
      ],
      "quantity_kind": "ratio",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:one",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Dimensionless ratio. Does not erase plane angle, solid angle, counts, probability bounds or other model-specific semantics.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "ratio.one",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:percent",
      "slug": "percent",
      "name": "Percent",
      "symbol": "%",
      "code": "percent",
      "aliases": [
        "percentage",
        "per cent"
      ],
      "quantity_kind": "ratio",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:one",
        "scale": {
          "numerator": "1",
          "denominator": "100"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 5.4.7: quantities with unit one and percent symbol"
        }
      ],
      "scope": "Ratio scale: 1 percent = 0.01. Percentage-point changes and relative percent changes require their own operation semantics.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "ratio.one",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:ppm",
      "slug": "parts-per-million",
      "name": "Parts per million",
      "symbol": "ppm",
      "code": "ppm",
      "aliases": [
        "parts-per-million"
      ],
      "quantity_kind": "ratio",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:one",
        "scale": {
          "numerator": "1",
          "denominator": "1000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Section 5.4.7: ratio quantities and ppm = 1e-6"
        }
      ],
      "scope": "Ratio scale only. A concentration must additionally declare mass/mass, volume/volume, mole fraction or other appropriate basis.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "ratio.one",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:m2",
      "slug": "square-metre",
      "name": "Square metre",
      "symbol": "m²",
      "code": "m2",
      "aliases": [
        "m^2",
        "m2",
        "square meter"
      ],
      "quantity_kind": "area",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:m2",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "area.m2",
      "usage_status": "current",
      "expression": {
        "cx:m": 2
      }
    },
    {
      "unit_id": "cx:cm2",
      "slug": "square-centimetre",
      "name": "Square centimetre",
      "symbol": "cm²",
      "code": "cm2",
      "aliases": [
        "cm2"
      ],
      "quantity_kind": "area",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m2",
        "scale": {
          "numerator": "1",
          "denominator": "10000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "area.m2",
      "usage_status": "current",
      "expression": {
        "cx:cm": 2
      }
    },
    {
      "unit_id": "cx:mm2",
      "slug": "square-millimetre",
      "name": "Square millimetre",
      "symbol": "mm²",
      "code": "mm2",
      "aliases": [
        "mm2"
      ],
      "quantity_kind": "area",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m2",
        "scale": {
          "numerator": "1",
          "denominator": "1000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "area.m2",
      "usage_status": "current",
      "expression": {
        "cx:mm": 2
      }
    },
    {
      "unit_id": "cx:km2",
      "slug": "square-kilometre",
      "name": "Square kilometre",
      "symbol": "km²",
      "code": "km2",
      "aliases": [
        "km2"
      ],
      "quantity_kind": "area",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m2",
        "scale": {
          "numerator": "1000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "area.m2",
      "usage_status": "current",
      "expression": {
        "cx:km": 2
      }
    },
    {
      "unit_id": "cx:ha",
      "slug": "hectare",
      "name": "Hectare",
      "symbol": "ha",
      "code": "ha",
      "aliases": [],
      "quantity_kind": "area",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m2",
        "scale": {
          "numerator": "10000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8: hectare = 10000 square metres"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "area.m2",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:cm3",
      "slug": "cubic-centimetre",
      "name": "Cubic centimetre",
      "symbol": "cm³",
      "code": "cm3",
      "aliases": [
        "cm^3",
        "cm3"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.1",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "1",
          "denominator": "1000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "volume.m3",
      "usage_status": "current",
      "expression": {
        "cx:cm": 3
      },
      "applicable_quantity_kinds": [
        "volume",
        "section_modulus"
      ]
    },
    {
      "unit_id": "cx:uL",
      "slug": "microlitre",
      "name": "Microlitre",
      "symbol": "µL",
      "code": "uL",
      "aliases": [
        "microliter",
        "μL",
        "uL"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "1",
          "denominator": "1000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8 litre = 1e-3 m3; Table 7 micro = 1e-6"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "volume.m3",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:Hz",
      "slug": "hertz",
      "name": "Hertz",
      "symbol": "Hz",
      "code": "Hz",
      "aliases": [],
      "quantity_kind": "frequency",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:Hz",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Frequency of periodic phenomena. Angular velocity has a distinct quantity kind; conversion requires an explicit relation.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "frequency.hz",
      "usage_status": "current",
      "expression": {
        "cx:s": -1
      }
    },
    {
      "unit_id": "cx:kHz",
      "slug": "kilohertz",
      "name": "Kilohertz",
      "symbol": "kHz",
      "code": "kHz",
      "aliases": [],
      "quantity_kind": "frequency",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Hz",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "frequency.hz",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:MHz",
      "slug": "megahertz",
      "name": "Megahertz",
      "symbol": "MHz",
      "code": "MHz",
      "aliases": [],
      "quantity_kind": "frequency",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Hz",
        "scale": {
          "numerator": "1000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "frequency.hz",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:GHz",
      "slug": "gigahertz",
      "name": "Gigahertz",
      "symbol": "GHz",
      "code": "GHz",
      "aliases": [],
      "quantity_kind": "frequency",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Hz",
        "scale": {
          "numerator": "1000000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "frequency.hz",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:rad_s",
      "slug": "radian-per-second",
      "name": "Radian per second",
      "symbol": "rad/s",
      "code": "rad_s",
      "aliases": [
        "rad/s",
        "radians per second"
      ],
      "quantity_kind": "angular_velocity",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:rad_s",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Angular velocity. Hertz is not silently treated as rad/s.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "angular_velocity.rad_s",
      "usage_status": "current",
      "expression": {
        "cx:rad": 1,
        "cx:s": -1
      }
    },
    {
      "unit_id": "cx:rpm",
      "slug": "revolution-per-minute",
      "name": "Revolution per minute",
      "symbol": "rpm",
      "code": "rpm",
      "aliases": [
        "rev/min"
      ],
      "quantity_kind": "angular_velocity",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:rad_s",
        "scale": {
          "numerator": "1",
          "denominator": "30",
          "pi_power": 1
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Radian full-turn definition and Table 8 minute: 2 pi / 60 rad/s"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "angular_velocity.rad_s",
      "usage_status": "current",
      "expression": {
        "cx:turn": 1,
        "cx:min": -1
      }
    },
    {
      "unit_id": "cx:m_s",
      "slug": "metre-per-second",
      "name": "Metre per second",
      "symbol": "m/s",
      "code": "m_s",
      "aliases": [
        "m/s",
        "meter per second"
      ],
      "quantity_kind": "speed",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:m_s",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "speed.m_s",
      "usage_status": "current",
      "expression": {
        "cx:m": 1,
        "cx:s": -1
      }
    },
    {
      "unit_id": "cx:km_h",
      "slug": "kilometre-per-hour",
      "name": "Kilometre per hour",
      "symbol": "km/h",
      "code": "km_h",
      "aliases": [
        "km/h",
        "kph"
      ],
      "quantity_kind": "speed",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m_s",
        "scale": {
          "numerator": "5",
          "denominator": "18"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "speed.m_s",
      "usage_status": "current",
      "expression": {
        "cx:km": 1,
        "cx:h": -1
      }
    },
    {
      "unit_id": "cx:m_s2",
      "slug": "metre-per-second-squared",
      "name": "Metre per second squared",
      "symbol": "m/s²",
      "code": "m_s2",
      "aliases": [
        "m/s2",
        "m/s^2"
      ],
      "quantity_kind": "acceleration",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:m_s2",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "acceleration.m_s2",
      "usage_status": "current",
      "expression": {
        "cx:m": 1,
        "cx:s": -2
      }
    },
    {
      "unit_id": "cx:N",
      "slug": "newton",
      "name": "Newton",
      "symbol": "N",
      "code": "N",
      "aliases": [],
      "quantity_kind": "force",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:N",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "force.n",
      "usage_status": "current",
      "expression": {
        "cx:kg": 1,
        "cx:m": 1,
        "cx:s": -2
      }
    },
    {
      "unit_id": "cx:kN",
      "slug": "kilonewton",
      "name": "Kilonewton",
      "symbol": "kN",
      "code": "kN",
      "aliases": [],
      "quantity_kind": "force",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:N",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "force.n",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:Pa",
      "slug": "pascal",
      "name": "Pascal",
      "symbol": "Pa",
      "code": "Pa",
      "aliases": [],
      "quantity_kind": "pressure",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:Pa",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Pascal is used for pressure and stress; model-field compatibility and absolute/gauge reference must be declared separately.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "pressure.pa",
      "usage_status": "current",
      "expression": {
        "cx:N": 1,
        "cx:m": -2
      }
    },
    {
      "unit_id": "cx:mPa",
      "slug": "millipascal",
      "name": "Millipascal",
      "symbol": "mPa",
      "code": "mPa",
      "aliases": [],
      "quantity_kind": "pressure",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Pa",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Case-sensitive symbol: mPa and MPa have different scales. Pressure reference is a separate model contract.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "pressure.pa",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:kPa",
      "slug": "kilopascal",
      "name": "Kilopascal",
      "symbol": "kPa",
      "code": "kPa",
      "aliases": [],
      "quantity_kind": "pressure",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Pa",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Case-sensitive symbol: mPa and MPa have different scales. Pressure reference is a separate model contract.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "pressure.pa",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:MPa",
      "slug": "megapascal",
      "name": "Megapascal",
      "symbol": "MPa",
      "code": "MPa",
      "aliases": [],
      "quantity_kind": "pressure",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Pa",
        "scale": {
          "numerator": "1000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Case-sensitive symbol: mPa and MPa have different scales. Pressure reference is a separate model contract.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "pressure.pa",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:bar",
      "slug": "bar",
      "name": "Bar",
      "symbol": "bar",
      "code": "bar",
      "aliases": [],
      "quantity_kind": "pressure",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Pa",
        "scale": {
          "numerator": "100000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8: bar = 100000 Pa"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "pressure.pa",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:atm",
      "slug": "standard-atmosphere",
      "name": "Standard atmosphere",
      "symbol": "atm",
      "code": "atm",
      "aliases": [],
      "quantity_kind": "pressure",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Pa",
        "scale": {
          "numerator": "101325",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Standard atmosphere = 101325 Pa exactly; not local measured atmospheric pressure"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "pressure.pa",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:J",
      "slug": "joule",
      "name": "Joule",
      "symbol": "J",
      "code": "J",
      "aliases": [],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Energy. Torque has the same SI dimension but a separate quantity kind.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "energy.j",
      "usage_status": "current",
      "expression": {
        "cx:N": 1,
        "cx:m": 1
      }
    },
    {
      "unit_id": "cx:kJ",
      "slug": "kilojoule",
      "name": "Kilojoule",
      "symbol": "kJ",
      "code": "kJ",
      "aliases": [],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:Wh",
      "slug": "watt-hour",
      "name": "Watt hour",
      "symbol": "Wh",
      "code": "Wh",
      "aliases": [],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "3600",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 4 watt = joule/second; Table 8 hour = 3600 s"
        }
      ],
      "scope": "Energy, not power. W to Wh requires an explicit power/time model.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:kWh",
      "slug": "kilowatt-hour",
      "name": "Kilowatt hour",
      "symbol": "kWh",
      "code": "kWh",
      "aliases": [],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "3600000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Watt = joule/second; kilo = 1000; hour = 3600 s"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:N_m",
      "slug": "newton-metre",
      "name": "Newton metre",
      "symbol": "N·m",
      "code": "N_m",
      "aliases": [
        "N*m",
        "N m"
      ],
      "quantity_kind": "torque",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:N_m",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Torque. Do not silently convert to energy solely because its dimension equals joule.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "torque.n_m",
      "usage_status": "current",
      "expression": {
        "cx:N": 1,
        "cx:m": 1
      }
    },
    {
      "unit_id": "cx:W",
      "slug": "watt",
      "name": "Watt",
      "symbol": "W",
      "code": "W",
      "aliases": [],
      "quantity_kind": "power",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:W",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Power. Conversion to energy requires an explicit time/model contract.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "power.w",
      "usage_status": "current",
      "expression": {
        "cx:J": 1,
        "cx:s": -1
      }
    },
    {
      "unit_id": "cx:mW",
      "slug": "milliwatt",
      "name": "Milliwatt",
      "symbol": "mW",
      "code": "mW",
      "aliases": [],
      "quantity_kind": "power",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:W",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "power.w",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:kW",
      "slug": "kilowatt",
      "name": "Kilowatt",
      "symbol": "kW",
      "code": "kW",
      "aliases": [],
      "quantity_kind": "power",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:W",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "power.w",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:MW",
      "slug": "megawatt",
      "name": "Megawatt",
      "symbol": "MW",
      "code": "MW",
      "aliases": [],
      "quantity_kind": "power",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:W",
        "scale": {
          "numerator": "1000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "power.w",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:A",
      "slug": "ampere",
      "name": "Ampere",
      "symbol": "A",
      "code": "A",
      "aliases": [],
      "quantity_kind": "electric_current",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:A",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 2, 4 and 5: SI units; Table 7: SI prefixes"
        }
      ],
      "scope": "Definition metadata only. The quantity kind and model field contract determine compatible use; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "electric_current.a",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:mA",
      "slug": "milliampere",
      "name": "Milliampere",
      "symbol": "mA",
      "code": "mA",
      "aliases": [
        "mA"
      ],
      "quantity_kind": "electric_current",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
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      "family_id": "amount_of_substance.mol",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:nmol",
      "slug": "nanomole",
      "name": "Nanomole",
      "symbol": "nmol",
      "code": "nmol",
      "aliases": [],
      "quantity_kind": "amount_of_substance",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:mol",
        "scale": {
          "numerator": "1",
          "denominator": "1000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "amount_of_substance.mol",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:klm",
      "slug": "kilolumen",
      "name": "Kilolumen",
      "symbol": "klm",
      "code": "klm",
      "aliases": [],
      "quantity_kind": "luminous_flux",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:lm",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "luminous_flux.lm",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:klx",
      "slug": "kilolux",
      "name": "Kilolux",
      "symbol": "klx",
      "code": "klx",
      "aliases": [],
      "quantity_kind": "illuminance",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:lx",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "illuminance.lx",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:nmi",
      "slug": "nautical-mile",
      "name": "Nautical mile",
      "symbol": "nmi",
      "code": "nmi",
      "aliases": [
        "nautical mile",
        "nautical miles"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "1852",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8: international nautical mile = 1852 m; nmi is this registry display convention"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "length.m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:angstrom",
      "slug": "angstrom",
      "name": "Angstrom",
      "symbol": "Å",
      "code": "angstrom",
      "aliases": [
        "angstrom",
        "ångström"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "1",
          "denominator": "10000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8: angstrom = 1e-10 m"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "length.m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:au",
      "slug": "astronomical-unit",
      "name": "Astronomical unit",
      "symbol": "au",
      "code": "au",
      "aliases": [],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "149597870700",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8 and IAU 2012 Resolution B2: astronomical unit"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "length.m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:mil",
      "slug": "mil-length",
      "name": "Mil (length)",
      "symbol": "mil",
      "code": "mil",
      "aliases": [
        "thou"
      ],
      "quantity_kind": "length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m",
        "scale": {
          "numerator": "127",
          "denominator": "5000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Mil (length); exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "One thousandth of the international inch. This is a length, not an angular mil.",
      "legacy_tools": [],
      "systems": [
        "international_yard_pound"
      ],
      "family_id": "length.m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:oz_av",
      "slug": "ounce-avoirdupois",
      "name": "Ounce (avoirdupois)",
      "symbol": "oz",
      "code": "oz_av",
      "aliases": [
        "oz"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "45359237",
          "denominator": "1600000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-hb44-2026",
          "locator": "Appendix C: avoirdupois mass, 16 ounces per pound"
        }
      ],
      "scope": "Named mass convention; do not infer avoirdupois/troy or short/long identity from the unqualified symbol.",
      "legacy_tools": [],
      "systems": [
        "us_customary"
      ],
      "family_id": "mass.kg",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:st",
      "slug": "stone",
      "name": "Stone",
      "symbol": "st",
      "code": "st",
      "aliases": [
        "st"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "317514659",
          "denominator": "50000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:uk-unit-definitions-1994",
          "locator": "Schedule: stone = 14 pounds"
        }
      ],
      "scope": "Named mass convention; do not infer avoirdupois/troy or short/long identity from the unqualified symbol.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "mass.kg",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:grain",
      "slug": "grain",
      "name": "Grain",
      "symbol": "gr",
      "code": "grain",
      "aliases": [
        "gr"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "6479891",
          "denominator": "100000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-hb44-2026",
          "locator": "Appendix C: 7000 grains per avoirdupois pound"
        }
      ],
      "scope": "Named mass convention; do not infer avoirdupois/troy or short/long identity from the unqualified symbol.",
      "legacy_tools": [],
      "systems": [
        "us_customary"
      ],
      "family_id": "mass.kg",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:oz_tr",
      "slug": "ounce-troy",
      "name": "Ounce (troy)",
      "symbol": "oz",
      "code": "oz_tr",
      "aliases": [
        "oz"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "19439673",
          "denominator": "625000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-hb44-2026",
          "locator": "Appendix C: troy ounce = 480 grains"
        }
      ],
      "scope": "Named mass convention; do not infer avoirdupois/troy or short/long identity from the unqualified symbol.",
      "legacy_tools": [],
      "systems": [
        "us_customary"
      ],
      "family_id": "mass.kg",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:ton_us",
      "slug": "short-ton",
      "name": "Short ton",
      "symbol": "ton",
      "code": "ton_us",
      "aliases": [
        "ton"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "45359237",
          "denominator": "50000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-hb44-2026",
          "locator": "Appendix C: short ton = 2000 pounds"
        }
      ],
      "scope": "Named mass convention; do not infer avoirdupois/troy or short/long identity from the unqualified symbol.",
      "legacy_tools": [],
      "systems": [
        "us_customary"
      ],
      "family_id": "mass.kg",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:ton_uk",
      "slug": "long-ton",
      "name": "Long ton",
      "symbol": "ton",
      "code": "ton_uk",
      "aliases": [
        "ton"
      ],
      "quantity_kind": "mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:kg",
        "scale": {
          "numerator": "317514659",
          "denominator": "312500"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:uk-unit-definitions-1994",
          "locator": "Schedule: long ton = 2240 pounds"
        }
      ],
      "scope": "Named mass convention; do not infer avoirdupois/troy or short/long identity from the unqualified symbol.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "mass.kg",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:week",
      "slug": "week-elapsed",
      "name": "Week (elapsed)",
      "symbol": "wk",
      "code": "week",
      "aliases": [
        "week"
      ],
      "quantity_kind": "duration",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:s",
        "scale": {
          "numerator": "604800",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8 day definition: exactly 7 elapsed days"
        }
      ],
      "scope": "Exactly seven elapsed 86400-second days; not a calendar/time-zone operation.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "duration.s",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:ft2_i",
      "slug": "square-international-foot",
      "name": "Square international foot",
      "symbol": "ft²",
      "code": "ft2_i",
      "aliases": [
        "ft2"
      ],
      "quantity_kind": "area",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m2",
        "scale": {
          "numerator": "145161",
          "denominator": "1562500"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "international_yard_pound"
      ],
      "family_id": "area.m2",
      "usage_status": "current",
      "expression": {
        "cx:ft_i": 2
      }
    },
    {
      "unit_id": "cx:in2_i",
      "slug": "square-international-inch",
      "name": "Square international inch",
      "symbol": "in²",
      "code": "in2_i",
      "aliases": [
        "in2"
      ],
      "quantity_kind": "area",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m2",
        "scale": {
          "numerator": "16129",
          "denominator": "25000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "international_yard_pound"
      ],
      "family_id": "area.m2",
      "usage_status": "current",
      "expression": {
        "cx:in_i": 2
      }
    },
    {
      "unit_id": "cx:ft3_i",
      "slug": "cubic-international-foot",
      "name": "Cubic international foot",
      "symbol": "ft³",
      "code": "ft3_i",
      "aliases": [
        "ft3"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "55306341",
          "denominator": "1953125000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "international_yard_pound"
      ],
      "family_id": "volume.m3",
      "usage_status": "current",
      "expression": {
        "cx:ft_i": 3
      },
      "applicable_quantity_kinds": [
        "volume",
        "section_modulus"
      ]
    },
    {
      "unit_id": "cx:in3_i",
      "slug": "cubic-international-inch",
      "name": "Cubic international inch",
      "symbol": "in³",
      "code": "in3_i",
      "aliases": [
        "in3"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "2048383",
          "denominator": "125000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "international_yard_pound"
      ],
      "family_id": "volume.m3",
      "usage_status": "current",
      "expression": {
        "cx:in_i": 3
      },
      "applicable_quantity_kinds": [
        "volume",
        "section_modulus"
      ]
    },
    {
      "unit_id": "cx:yd3_i",
      "slug": "cubic-international-yard",
      "name": "Cubic international yard",
      "symbol": "yd³",
      "code": "yd3_i",
      "aliases": [
        "yd3"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "1493271207",
          "denominator": "1953125000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "international_yard_pound"
      ],
      "family_id": "volume.m3",
      "usage_status": "current",
      "expression": {
        "cx:yd_i": 3
      },
      "applicable_quantity_kinds": [
        "volume",
        "section_modulus"
      ]
    },
    {
      "unit_id": "cx:gal_us",
      "slug": "gallon-us-liquid",
      "name": "Gallon (US liquid)",
      "symbol": "gal",
      "code": "gal_us",
      "aliases": [
        "gal"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "473176473",
          "denominator": "125000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-hb44-2026",
          "locator": "Appendix C, liquid volume: gallon = 231 in³, 4 quarts, 8 pints, 128 fluid ounces"
        }
      ],
      "scope": "Liquid volume convention. US liquid and Imperial definitions are distinct; not mass ounces or dry measures.",
      "legacy_tools": [],
      "systems": [
        "us_customary"
      ],
      "family_id": "volume.m3",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:qt_us",
      "slug": "quart-us-liquid",
      "name": "Quart (US liquid)",
      "symbol": "qt",
      "code": "qt_us",
      "aliases": [
        "qt"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "473176473",
          "denominator": "500000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-hb44-2026",
          "locator": "Appendix C, liquid volume: gallon = 231 in³, 4 quarts, 8 pints, 128 fluid ounces"
        }
      ],
      "scope": "Liquid volume convention. US liquid and Imperial definitions are distinct; not mass ounces or dry measures.",
      "legacy_tools": [],
      "systems": [
        "us_customary"
      ],
      "family_id": "volume.m3",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:pt_us",
      "slug": "pint-us-liquid",
      "name": "Pint (US liquid)",
      "symbol": "pt",
      "code": "pt_us",
      "aliases": [
        "pt"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "473176473",
          "denominator": "1000000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-hb44-2026",
          "locator": "Appendix C, liquid volume: gallon = 231 in³, 4 quarts, 8 pints, 128 fluid ounces"
        }
      ],
      "scope": "Liquid volume convention. US liquid and Imperial definitions are distinct; not mass ounces or dry measures.",
      "legacy_tools": [],
      "systems": [
        "us_customary"
      ],
      "family_id": "volume.m3",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:floz_us",
      "slug": "fluid-ounce-us-liquid",
      "name": "Fluid ounce (US liquid)",
      "symbol": "fl oz",
      "code": "floz_us",
      "aliases": [
        "fl oz"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "473176473",
          "denominator": "16000000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-hb44-2026",
          "locator": "Appendix C, liquid volume: gallon = 231 in³, 4 quarts, 8 pints, 128 fluid ounces"
        }
      ],
      "scope": "Liquid volume convention. US liquid and Imperial definitions are distinct; not mass ounces or dry measures.",
      "legacy_tools": [],
      "systems": [
        "us_customary"
      ],
      "family_id": "volume.m3",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:gal_imp",
      "slug": "gallon-imperial",
      "name": "Gallon (Imperial)",
      "symbol": "gal",
      "code": "gal_imp",
      "aliases": [
        "gal"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "454609",
          "denominator": "100000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:uk-unit-definitions-1994",
          "locator": "Schedule: imperial gallon = 4.54609 dm³; quart = 1/4 gallon, pint = 1/8 gallon, fluid ounce = 1/160 gallon"
        }
      ],
      "scope": "Liquid volume convention. US liquid and Imperial definitions are distinct; not mass ounces or dry measures.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "volume.m3",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:qt_imp",
      "slug": "quart-imperial",
      "name": "Quart (Imperial)",
      "symbol": "qt",
      "code": "qt_imp",
      "aliases": [
        "qt"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "454609",
          "denominator": "400000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:uk-unit-definitions-1994",
          "locator": "Schedule: imperial gallon = 4.54609 dm³; quart = 1/4 gallon, pint = 1/8 gallon, fluid ounce = 1/160 gallon"
        }
      ],
      "scope": "Liquid volume convention. US liquid and Imperial definitions are distinct; not mass ounces or dry measures.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "volume.m3",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:pt_imp",
      "slug": "pint-imperial",
      "name": "Pint (Imperial)",
      "symbol": "pt",
      "code": "pt_imp",
      "aliases": [
        "pt"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "454609",
          "denominator": "800000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:uk-unit-definitions-1994",
          "locator": "Schedule: imperial gallon = 4.54609 dm³; quart = 1/4 gallon, pint = 1/8 gallon, fluid ounce = 1/160 gallon"
        }
      ],
      "scope": "Liquid volume convention. US liquid and Imperial definitions are distinct; not mass ounces or dry measures.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "volume.m3",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:floz_imp",
      "slug": "fluid-ounce-imperial",
      "name": "Fluid ounce (Imperial)",
      "symbol": "fl oz",
      "code": "floz_imp",
      "aliases": [
        "fl oz"
      ],
      "quantity_kind": "volume",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m3",
        "scale": {
          "numerator": "454609",
          "denominator": "16000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:uk-unit-definitions-1994",
          "locator": "Schedule: imperial gallon = 4.54609 dm³; quart = 1/4 gallon, pint = 1/8 gallon, fluid ounce = 1/160 gallon"
        }
      ],
      "scope": "Liquid volume convention. US liquid and Imperial definitions are distinct; not mass ounces or dry measures.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "volume.m3",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:mph",
      "slug": "mile-per-hour",
      "name": "Mile per hour",
      "symbol": "mph",
      "code": "mph",
      "aliases": [],
      "quantity_kind": "speed",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m_s",
        "scale": {
          "numerator": "1397",
          "denominator": "3125"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "speed.m_s",
      "usage_status": "current",
      "expression": {
        "cx:mi_i": 1,
        "cx:h": -1
      }
    },
    {
      "unit_id": "cx:ft_s",
      "slug": "foot-per-second",
      "name": "Foot per second",
      "symbol": "ft/s",
      "code": "ft_s",
      "aliases": [],
      "quantity_kind": "speed",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m_s",
        "scale": {
          "numerator": "381",
          "denominator": "1250"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "speed.m_s",
      "usage_status": "current",
      "expression": {
        "cx:ft_i": 1,
        "cx:s": -1
      }
    },
    {
      "unit_id": "cx:kn",
      "slug": "knot",
      "name": "Knot",
      "symbol": "kn",
      "code": "kn",
      "aliases": [],
      "quantity_kind": "speed",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m_s",
        "scale": {
          "numerator": "463",
          "denominator": "900"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "International nautical mile per hour. kn is the registry display convention.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "speed.m_s",
      "usage_status": "current",
      "expression": {
        "cx:nmi": 1,
        "cx:h": -1
      }
    },
    {
      "unit_id": "cx:g0",
      "slug": "standard-gravity-unit",
      "name": "Standard gravity unit",
      "symbol": "g₀",
      "code": "g0",
      "aliases": [
        "g_n",
        "standard gravity"
      ],
      "quantity_kind": "acceleration",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m_s2",
        "scale": {
          "numerator": "196133",
          "denominator": "20000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Standard gravity unit; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Defined conventional acceleration. It is not local gravitational acceleration or a mass gram.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "acceleration.m_s2",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:Gal",
      "slug": "gal",
      "name": "Gal",
      "symbol": "Gal",
      "code": "Gal",
      "aliases": [],
      "quantity_kind": "acceleration",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:m_s2",
        "scale": {
          "numerator": "1",
          "denominator": "100"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8: Gal = 1 cm/s²"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "cgs"
      ],
      "family_id": "acceleration.m_s2",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:lbf",
      "slug": "pound-force",
      "name": "Pound-force",
      "symbol": "lbf",
      "code": "lbf",
      "aliases": [],
      "quantity_kind": "force",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:N",
        "scale": {
          "numerator": "8896443230521",
          "denominator": "2000000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Pound-force; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Conventional force unit. kgf and lbf use standard gravity; they are not mass units.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "force.n",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:kgf",
      "slug": "kilogram-force",
      "name": "Kilogram-force",
      "symbol": "kgf",
      "code": "kgf",
      "aliases": [],
      "quantity_kind": "force",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:N",
        "scale": {
          "numerator": "196133",
          "denominator": "20000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Kilogram-force; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Conventional force unit. kgf and lbf use standard gravity; they are not mass units.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "force.n",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:ozf",
      "slug": "ounce-force",
      "name": "Ounce-force",
      "symbol": "ozf",
      "code": "ozf",
      "aliases": [],
      "quantity_kind": "force",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:N",
        "scale": {
          "numerator": "8896443230521",
          "denominator": "32000000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Ounce-force; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Conventional force unit. kgf and lbf use standard gravity; they are not mass units.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "force.n",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:kip",
      "slug": "kip",
      "name": "Kip",
      "symbol": "kip",
      "code": "kip",
      "aliases": [],
      "quantity_kind": "force",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:N",
        "scale": {
          "numerator": "8896443230521",
          "denominator": "2000000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Kip; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Conventional force unit. kgf and lbf use standard gravity; they are not mass units.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "force.n",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:dyn",
      "slug": "dyne",
      "name": "Dyne",
      "symbol": "dyn",
      "code": "dyn",
      "aliases": [],
      "quantity_kind": "force",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:N",
        "scale": {
          "numerator": "1",
          "denominator": "100000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Dyne; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Conventional force unit. kgf and lbf use standard gravity; they are not mass units.",
      "legacy_tools": [],
      "systems": [
        "cgs"
      ],
      "family_id": "force.n",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:psi",
      "slug": "pound-force-per-square-inch",
      "name": "Pound-force per square inch",
      "symbol": "psi",
      "code": "psi",
      "aliases": [],
      "quantity_kind": "pressure",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Pa",
        "scale": {
          "numerator": "8896443230521",
          "denominator": "1290320000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Pound-force per square inch; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Pressure scale only; absolute/gauge reference remains a separate model condition.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "pressure.pa",
      "usage_status": "current",
      "expression": {
        "cx:lbf": 1,
        "cx:in_i": -2
      }
    },
    {
      "unit_id": "cx:ksi",
      "slug": "kilopound-force-per-square-inch",
      "name": "Kilopound-force per square inch",
      "symbol": "ksi",
      "code": "ksi",
      "aliases": [],
      "quantity_kind": "pressure",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Pa",
        "scale": {
          "numerator": "8896443230521",
          "denominator": "1290320"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Kilopound-force per square inch; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Pressure scale only; absolute/gauge reference remains a separate model condition.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "pressure.pa",
      "usage_status": "current",
      "expression": {
        "cx:kip": 1,
        "cx:in_i": -2
      }
    },
    {
      "unit_id": "cx:psf",
      "slug": "pound-force-per-square-foot",
      "name": "Pound-force per square foot",
      "symbol": "psf",
      "code": "psf",
      "aliases": [],
      "quantity_kind": "pressure",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Pa",
        "scale": {
          "numerator": "8896443230521",
          "denominator": "185806080000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Pound-force per square foot; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Pressure scale only; absolute/gauge reference remains a separate model condition.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "pressure.pa",
      "usage_status": "current",
      "expression": {
        "cx:lbf": 1,
        "cx:ft_i": -2
      }
    },
    {
      "unit_id": "cx:mbar",
      "slug": "millibar",
      "name": "Millibar",
      "symbol": "mbar",
      "code": "mbar",
      "aliases": [],
      "quantity_kind": "pressure",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Pa",
        "scale": {
          "numerator": "100",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Millibar; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Pressure scale only; absolute/gauge reference remains a separate model condition.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "pressure.pa",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:cal_th",
      "slug": "calorie-thermochemical",
      "name": "Calorie (thermochemical)",
      "symbol": "cal",
      "code": "cal_th",
      "aliases": [
        "cal"
      ],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "523",
          "denominator": "125"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Calorie (thermochemical); exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Explicit calorie convention. Thermochemical and International Table calories differ; unqualified calorie requires a definition choice.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:cal_IT",
      "slug": "calorie-international-table",
      "name": "Calorie (International Table)",
      "symbol": "cal",
      "code": "cal_IT",
      "aliases": [
        "cal"
      ],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "10467",
          "denominator": "2500"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Calorie (International Table); exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Explicit calorie convention. Thermochemical and International Table calories differ; unqualified calorie requires a definition choice.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:kcal_th",
      "slug": "kilocalorie-thermochemical",
      "name": "Kilocalorie (thermochemical)",
      "symbol": "kcal",
      "code": "kcal_th",
      "aliases": [
        "kcal"
      ],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "4184",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Kilocalorie (thermochemical); exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Explicit calorie convention. Thermochemical and International Table calories differ; unqualified calorie requires a definition choice.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:kcal_IT",
      "slug": "kilocalorie-international-table",
      "name": "Kilocalorie (International Table)",
      "symbol": "kcal",
      "code": "kcal_IT",
      "aliases": [
        "kcal"
      ],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "20934",
          "denominator": "5"
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        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Kilocalorie (International Table); exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Explicit calorie convention. Thermochemical and International Table calories differ; unqualified calorie requires a definition choice.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:Btu_IT",
      "slug": "british-thermal-unit-international-table",
      "name": "British thermal unit (International Table)",
      "symbol": "BTU",
      "code": "Btu_IT",
      "aliases": [
        "Btu",
        "BTU_IT"
      ],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
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      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "52752792631",
          "denominator": "50000000"
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        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nbs-heating-values-1982",
          "locator": "Appendix A3.2.2, PDF p.84: exact International Table Btu in joules"
        }
      ],
      "scope": "International Table convention only; generic BTU may refer to other thermal conventions.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:eV",
      "slug": "electronvolt",
      "name": "Electronvolt",
      "symbol": "eV",
      "code": "eV",
      "aliases": [],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "801088317",
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        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8 and SI defining elementary charge: electronvolt; Table 7 prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:keV",
      "slug": "kiloelectronvolt",
      "name": "Kiloelectronvolt",
      "symbol": "keV",
      "code": "keV",
      "aliases": [],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
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        "offset": {
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      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8 and SI defining elementary charge: electronvolt; Table 7 prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:MeV",
      "slug": "megaelectronvolt",
      "name": "Megaelectronvolt",
      "symbol": "MeV",
      "code": "MeV",
      "aliases": [],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
        "scale": {
          "numerator": "801088317",
          "denominator": "5000000000000000000000"
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        "offset": {
          "numerator": "0",
          "denominator": "1"
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      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8 and SI defining elementary charge: electronvolt; Table 7 prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:GeV",
      "slug": "gigaelectronvolt",
      "name": "Gigaelectronvolt",
      "symbol": "GeV",
      "code": "GeV",
      "aliases": [],
      "quantity_kind": "energy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:J",
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          "numerator": "801088317",
          "denominator": "5000000000000000000"
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        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Table 8 and SI defining elementary charge: electronvolt; Table 7 prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "energy.j",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:elementary_charge",
      "slug": "elementary-charge-unit",
      "name": "Elementary charge unit",
      "symbol": "e",
      "code": "elementary_charge",
      "aliases": [
        "elementary_charge",
        "elementary charge"
      ],
      "quantity_kind": "electric_charge",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:C",
        "scale": {
          "numerator": "801088317",
          "denominator": "5000000000000000000000000000"
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        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "SI defining constant e: positive elementary-charge magnitude"
        }
      ],
      "scope": "Positive elementary-charge magnitude as a charge unit; not the signed charge of a particular particle.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "electric_charge.c",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:hp_mech",
      "slug": "horsepower-mechanical",
      "name": "Horsepower (mechanical)",
      "symbol": "hp",
      "code": "hp_mech",
      "aliases": [
        "mechanical horsepower"
      ],
      "quantity_kind": "power",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:W",
        "scale": {
          "numerator": "37284993579113511",
          "denominator": "50000000000000"
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        "offset": {
          "numerator": "0",
          "denominator": "1"
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      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: mechanical horsepower = 550 ft·lbf/s; derived using exact international foot, pound and standard gravity"
        }
      ],
      "scope": "Mechanical horsepower convention. bhp describes a measurement location, not a separate exact unit; electrical, boiler and metric horsepower differ.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "power.w",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:Btu_IT_h",
      "slug": "british-thermal-unit-per-hour-it",
      "name": "British thermal unit per hour (IT)",
      "symbol": "BTU/h",
      "code": "Btu_IT_h",
      "aliases": [],
      "quantity_kind": "power",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:W",
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          "numerator": "52752792631",
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        "offset": {
          "numerator": "0",
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      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: IT Btu per hour; refrigeration ton = 12000 Btu_IT/h"
        }
      ],
      "scope": "Explicit International Table Btu convention. No thermodynamic cooling-process model is implied.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "power.w",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:TR_IT",
      "slug": "ton-of-refrigeration-it",
      "name": "Ton of refrigeration (IT)",
      "symbol": "TR",
      "code": "TR_IT",
      "aliases": [],
      "quantity_kind": "power",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:W",
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        "offset": {
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          "denominator": "1"
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      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: IT Btu per hour; refrigeration ton = 12000 Btu_IT/h"
        }
      ],
      "scope": "Explicit International Table Btu convention. No thermodynamic cooling-process model is implied.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "power.w",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:m3_s",
      "slug": "cubic-metre-per-second",
      "name": "Cubic metre per second",
      "symbol": "m³/s",
      "code": "m3_s",
      "aliases": [
        "m3/s"
      ],
      "quantity_kind": "volume_flow_rate",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:m3_s",
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          "denominator": "1"
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        "offset": {
          "numerator": "0",
          "denominator": "1"
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      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "volume_flow_rate.m3_s",
      "usage_status": "current",
      "expression": {
        "cx:m3": 1,
        "cx:s": -1
      }
    },
    {
      "unit_id": "cx:kg_s",
      "slug": "kilogram-per-second",
      "name": "Kilogram per second",
      "symbol": "kg/s",
      "code": "kg_s",
      "aliases": [],
      "quantity_kind": "mass_flow_rate",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:kg_s",
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          "denominator": "1"
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        "offset": {
          "numerator": "0",
          "denominator": "1"
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      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "mass_flow_rate.kg_s",
      "usage_status": "current",
      "expression": {
        "cx:kg": 1,
        "cx:s": -1
      }
    },
    {
      "unit_id": "cx:kg_m3",
      "slug": "kilogram-per-cubic-metre",
      "name": "Kilogram per cubic metre",
      "symbol": "kg/m³",
      "code": "kg_m3",
      "aliases": [
        "kg/m3"
      ],
      "quantity_kind": "mass_density",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:kg_m3",
        "scale": {
          "numerator": "1",
          "denominator": "1"
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        "offset": {
          "numerator": "0",
          "denominator": "1"
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      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "mass_density.kg_m3",
      "usage_status": "current",
      "expression": {
        "cx:kg": 1,
        "cx:m3": -1
      },
      "applicable_quantity_kinds": [
        "mass_density",
        "mass_concentration"
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    },
    {
      "unit_id": "cx:mol_m3",
      "slug": "mole-per-cubic-metre",
      "name": "Mole per cubic metre",
      "symbol": "mol/m³",
      "code": "mol_m3",
      "aliases": [
        "mol/m3"
      ],
      "quantity_kind": "amount_concentration",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:mol_m3",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "amount_concentration.mol_m3",
      "usage_status": "current",
      "expression": {
        "cx:mol": 1,
        "cx:m3": -1
      }
    },
    {
      "unit_id": "cx:kg_mol",
      "slug": "kilogram-per-mole",
      "name": "Kilogram per mole",
      "symbol": "kg/mol",
      "code": "kg_mol",
      "aliases": [],
      "quantity_kind": "molar_mass",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:kg_mol",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "molar_mass.kg_mol",
      "usage_status": "current",
      "expression": {
        "cx:kg": 1,
        "cx:mol": -1
      }
    },
    {
      "unit_id": "cx:Pa_s",
      "slug": "pascal-second",
      "name": "Pascal second",
      "symbol": "Pa·s",
      "code": "Pa_s",
      "aliases": [
        "Pa*s"
      ],
      "quantity_kind": "dynamic_viscosity",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
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      "name": "Inch to the fourth power",
      "symbol": "in⁴",
      "code": "in4",
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        "in4"
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      "unit_id": "cx:ft4",
      "slug": "foot-to-the-fourth-power",
      "name": "Foot to the fourth power",
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      "unit_id": "cx:mm3",
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      "name": "Pound-force foot",
      "symbol": "lbf·ft",
      "code": "lbf_ft",
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        "lbf*ft"
      ],
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          "source_id": "source:bipm-si-9-v4.01",
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          "source_id": "source:bipm-si-9-v4.01",
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        "kW/m2"
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        "uPa·s",
        "µPa*s"
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          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Micropascal second; exact relation distinguished from rounded tabular display"
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      "systems": [
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      "code": "cP",
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          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Centipoise; exact relation distinguished from rounded tabular display"
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          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Stokes; exact relation distinguished from rounded tabular display"
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          "source_id": "source:nist-sp811-b8",
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      "systems": [
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        "uS/cm"
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      "owner_pack": "core.metrology",
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          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
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      "systems": [
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      "owner_pack": "core.metrology",
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          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
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      "legacy_tools": [],
      "systems": [
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      "owner_pack": "core.metrology",
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      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:VA",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "apparent_power.va",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:MVA",
      "slug": "megavolt-ampere",
      "name": "Megavolt ampere",
      "symbol": "MVA",
      "code": "MVA",
      "aliases": [],
      "quantity_kind": "apparent_power",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:VA",
        "scale": {
          "numerator": "1000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "apparent_power.va",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:kvar",
      "slug": "kilovar",
      "name": "Kilovar",
      "symbol": "kvar",
      "code": "kvar",
      "aliases": [],
      "quantity_kind": "reactive_power",
      "owner_pack": "core.metrology",
      "revision": "1.0.1",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:var",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "reactive_power.var",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:Mvar",
      "slug": "megavar",
      "name": "Megavar",
      "symbol": "Mvar",
      "code": "Mvar",
      "aliases": [],
      "quantity_kind": "reactive_power",
      "owner_pack": "core.metrology",
      "revision": "1.0.1",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:var",
        "scale": {
          "numerator": "1000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_accepted"
      ],
      "family_id": "reactive_power.var",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:kBq",
      "slug": "kilobecquerel",
      "name": "Kilobecquerel",
      "symbol": "kBq",
      "code": "kBq",
      "aliases": [],
      "quantity_kind": "radioactivity",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Bq",
        "scale": {
          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "radioactivity.bq",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:MBq",
      "slug": "megabecquerel",
      "name": "Megabecquerel",
      "symbol": "MBq",
      "code": "MBq",
      "aliases": [],
      "quantity_kind": "radioactivity",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Bq",
        "scale": {
          "numerator": "1000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "radioactivity.bq",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:mGy",
      "slug": "milligray",
      "name": "Milligray",
      "symbol": "mGy",
      "code": "mGy",
      "aliases": [],
      "quantity_kind": "absorbed_dose",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Gy",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "absorbed_dose.gy",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:mSv",
      "slug": "millisievert",
      "name": "Millisievert",
      "symbol": "mSv",
      "code": "mSv",
      "aliases": [],
      "quantity_kind": "dose_equivalent",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Sv",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "dose_equivalent.sv",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:uSv",
      "slug": "microsievert",
      "name": "Microsievert",
      "symbol": "µSv",
      "code": "uSv",
      "aliases": [
        "μSv",
        "uSv"
      ],
      "quantity_kind": "dose_equivalent",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Sv",
        "scale": {
          "numerator": "1",
          "denominator": "1000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "dose_equivalent.sv",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:G",
      "slug": "gauss",
      "name": "Gauss",
      "symbol": "G",
      "code": "G",
      "aliases": [],
      "quantity_kind": "magnetic_flux_density",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:T",
        "scale": {
          "numerator": "1",
          "denominator": "10000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: Gauss; exact relation distinguished from rounded tabular display"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "cgs"
      ],
      "family_id": "magnetic_flux_density.t",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:bit",
      "slug": "bit",
      "name": "Bit",
      "symbol": "bit",
      "code": "bit",
      "aliases": [],
      "quantity_kind": "information",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:bit",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Examples: bit quantity and 8-bit byte"
        }
      ],
      "scope": "Information quantity, distinct from a physical ratio, numerical base, bit pattern or encoding.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information.bit",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:byte",
      "slug": "byte",
      "name": "Byte",
      "symbol": "B",
      "code": "byte",
      "aliases": [
        "byte",
        "bytes"
      ],
      "quantity_kind": "information",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit",
        "scale": {
          "numerator": "8",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Examples: 1 B = 8 bit"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information.bit",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:kB",
      "slug": "kilobyte",
      "name": "Kilobyte",
      "symbol": "kB",
      "code": "kB",
      "aliases": [],
      "quantity_kind": "information",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit",
        "scale": {
          "numerator": "8000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Binary prefix table and SI comparisons: decimal k/M/G/T versus Ki/Mi/Gi/Ti"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information.bit",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:MB",
      "slug": "megabyte",
      "name": "Megabyte",
      "symbol": "MB",
      "code": "MB",
      "aliases": [],
      "quantity_kind": "information",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit",
        "scale": {
          "numerator": "8000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Binary prefix table and SI comparisons: decimal k/M/G/T versus Ki/Mi/Gi/Ti"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information.bit",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:GB",
      "slug": "gigabyte",
      "name": "Gigabyte",
      "symbol": "GB",
      "code": "GB",
      "aliases": [],
      "quantity_kind": "information",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit",
        "scale": {
          "numerator": "8000000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Binary prefix table and SI comparisons: decimal k/M/G/T versus Ki/Mi/Gi/Ti"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information.bit",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:TB",
      "slug": "terabyte",
      "name": "Terabyte",
      "symbol": "TB",
      "code": "TB",
      "aliases": [],
      "quantity_kind": "information",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit",
        "scale": {
          "numerator": "8000000000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Binary prefix table and SI comparisons: decimal k/M/G/T versus Ki/Mi/Gi/Ti"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information.bit",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:KiB",
      "slug": "kibibyte",
      "name": "Kibibyte",
      "symbol": "KiB",
      "code": "KiB",
      "aliases": [],
      "quantity_kind": "information",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit",
        "scale": {
          "numerator": "8192",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Binary prefix table and SI comparisons: decimal k/M/G/T versus Ki/Mi/Gi/Ti"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information.bit",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:MiB",
      "slug": "mebibyte",
      "name": "Mebibyte",
      "symbol": "MiB",
      "code": "MiB",
      "aliases": [],
      "quantity_kind": "information",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit",
        "scale": {
          "numerator": "8388608",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Binary prefix table and SI comparisons: decimal k/M/G/T versus Ki/Mi/Gi/Ti"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information.bit",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:GiB",
      "slug": "gibibyte",
      "name": "Gibibyte",
      "symbol": "GiB",
      "code": "GiB",
      "aliases": [],
      "quantity_kind": "information",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit",
        "scale": {
          "numerator": "8589934592",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Binary prefix table and SI comparisons: decimal k/M/G/T versus Ki/Mi/Gi/Ti"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information.bit",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:TiB",
      "slug": "tebibyte",
      "name": "Tebibyte",
      "symbol": "TiB",
      "code": "TiB",
      "aliases": [],
      "quantity_kind": "information",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit",
        "scale": {
          "numerator": "8796093022208",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Binary prefix table and SI comparisons: decimal k/M/G/T versus Ki/Mi/Gi/Ti"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information.bit",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:bit_s",
      "slug": "bit-per-second",
      "name": "Bit per second",
      "symbol": "bit/s",
      "code": "bit_s",
      "aliases": [],
      "quantity_kind": "information_rate",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:bit_s",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information_rate.bit_s",
      "usage_status": "current",
      "expression": {
        "cx:bit": 1,
        "cx:s": -1
      }
    },
    {
      "unit_id": "cx:kbit_s",
      "slug": "kilobit-per-second",
      "name": "Kilobit per second",
      "symbol": "kbit/s",
      "code": "kbit_s",
      "aliases": [],
      "quantity_kind": "information_rate",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit_s",
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          "numerator": "1000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Decimal multiples and 8-bit byte; rate is per SI second"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information_rate.bit_s",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:Mbit_s",
      "slug": "megabit-per-second",
      "name": "Megabit per second",
      "symbol": "Mbit/s",
      "code": "Mbit_s",
      "aliases": [],
      "quantity_kind": "information_rate",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit_s",
        "scale": {
          "numerator": "1000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Decimal multiples and 8-bit byte; rate is per SI second"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information_rate.bit_s",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:Gbit_s",
      "slug": "gigabit-per-second",
      "name": "Gigabit per second",
      "symbol": "Gbit/s",
      "code": "Gbit_s",
      "aliases": [],
      "quantity_kind": "information_rate",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit_s",
        "scale": {
          "numerator": "1000000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Decimal multiples and 8-bit byte; rate is per SI second"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information_rate.bit_s",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:byte_s",
      "slug": "byte-per-second",
      "name": "Byte per second",
      "symbol": "B/s",
      "code": "byte_s",
      "aliases": [],
      "quantity_kind": "information_rate",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:bit_s",
        "scale": {
          "numerator": "8",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-binary-prefixes",
          "locator": "Decimal multiples and 8-bit byte; rate is per SI second"
        }
      ],
      "scope": "Definition metadata. Quantity kind and model-field semantics determine compatibility; no new UUCE execution or CVP claim.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "information_rate.bit_s",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:per_s",
      "slug": "reciprocal-second",
      "name": "Reciprocal second",
      "symbol": "s⁻¹",
      "code": "per_s",
      "aliases": [
        "1/s",
        "/s",
        "s^-1"
      ],
      "quantity_kind": "inverse_time",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:per_s",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "expression": {
        "cx:s": -1
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "SI algebra: inverse time; equal dimension alone does not identify frequency or activity"
        }
      ],
      "scope": "Inverse-time scale used for rates. It does not infer cyclic frequency, angular frequency, radioactivity or an application model from a bare 1/s label.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "inverse_time.per_s",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:V_K",
      "slug": "volt-per-kelvin-difference",
      "name": "Volt per kelvin difference",
      "symbol": "V/K",
      "code": "V_K",
      "aliases": [],
      "quantity_kind": "voltage_temperature_coefficient",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:V_K",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "expression": {
        "cx:V": 1,
        "cx:K": -1
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: explicit coherent SI unit algebra; application semantics retained as a separate quantity kind"
        }
      ],
      "scope": "Field-specific unit scale. Same dimension is insufficient to establish model compatibility; temperature factors, when present, are intervals.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "voltage_temperature_coefficient.v_k",
      "usage_status": "current",
      "expression_roles": {
        "cx:K": "interval"
      }
    },
    {
      "unit_id": "cx:V_delta_degC",
      "slug": "volt-per-celsius-difference",
      "name": "Volt per Celsius difference",
      "symbol": "V/°C",
      "code": "V_delta_degC",
      "aliases": [],
      "quantity_kind": "voltage_temperature_coefficient",
      "owner_pack": "core.metrology",
      "revision": "1.0.1",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:V_K",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "expression": {
        "cx:V": 1,
        "cx:degC": -1
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: explicit coherent SI unit algebra; application semantics retained as a separate quantity kind"
        }
      ],
      "scope": "Field-specific unit scale. Same dimension is insufficient to establish model compatibility; temperature factors, when present, are intervals.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "voltage_temperature_coefficient.v_k",
      "usage_status": "current",
      "expression_roles": {
        "cx:degC": "interval"
      }
    },
    {
      "unit_id": "cx:A_V2",
      "slug": "ampere-per-square-volt",
      "name": "Ampere per square volt",
      "symbol": "A/V²",
      "code": "A_V2",
      "aliases": [],
      "quantity_kind": "transconductance_parameter",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:A_V2",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "expression": {
        "cx:A": 1,
        "cx:V": -2
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: explicit coherent SI unit algebra; application semantics retained as a separate quantity kind"
        }
      ],
      "scope": "Field-specific unit scale. Same dimension is insufficient to establish model compatibility; temperature factors, when present, are intervals.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "transconductance_parameter.a_v2",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:ohm_per_m",
      "slug": "ohm-per-metre",
      "name": "Ohm per metre",
      "symbol": "Ω/m",
      "code": "ohm_per_m",
      "aliases": [],
      "quantity_kind": "resistance_per_length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:ohm_per_m",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "expression": {
        "cx:ohm": 1,
        "cx:m": -1
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: explicit coherent SI unit algebra; application semantics retained as a separate quantity kind"
        }
      ],
      "scope": "Field-specific unit scale. Same dimension is insufficient to establish model compatibility; temperature factors, when present, are intervals.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "resistance_per_length.ohm_per_m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:ohm_per_km",
      "slug": "ohm-per-kilometre",
      "name": "Ohm per kilometre",
      "symbol": "Ω/km",
      "code": "ohm_per_km",
      "aliases": [],
      "quantity_kind": "resistance_per_length",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:ohm_per_m",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "expression": {
        "cx:ohm": 1,
        "cx:km": -1
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: explicit coherent SI unit algebra; application semantics retained as a separate quantity kind"
        }
      ],
      "scope": "Field-specific unit scale. Same dimension is insufficient to establish model compatibility; temperature factors, when present, are intervals.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "resistance_per_length.ohm_per_m",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:fc",
      "slug": "footcandle",
      "name": "Footcandle",
      "symbol": "fc",
      "code": "fc",
      "aliases": [],
      "quantity_kind": "illuminance",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:lx",
        "scale": {
          "numerator": "1562500",
          "denominator": "145161"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: footcandle; 1 lm per international ft²"
        }
      ],
      "scope": "Explicit unit scale. Luminous flux/intensity/illuminance conversion still requires geometry; activity is not equivalent dose or cyclic frequency.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "illuminance.lx",
      "usage_status": "current",
      "expression": {
        "cx:lm": 1,
        "cx:ft2_i": -1
      }
    },
    {
      "unit_id": "cx:Ci",
      "slug": "curie",
      "name": "Curie",
      "symbol": "Ci",
      "code": "Ci",
      "aliases": [],
      "quantity_kind": "radioactivity",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:Bq",
        "scale": {
          "numerator": "37000000000",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:nist-sp811-b8",
          "locator": "Appendix B.8: curie = 3.7e10 Bq exactly"
        }
      ],
      "scope": "Explicit unit scale. Luminous flux/intensity/illuminance conversion still requires geometry; activity is not equivalent dose or cyclic frequency.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "radioactivity.bq",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:mcd",
      "slug": "millicandela",
      "name": "Millicandela",
      "symbol": "mcd",
      "code": "mcd",
      "aliases": [],
      "quantity_kind": "luminous_intensity",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:cd",
        "scale": {
          "numerator": "1",
          "denominator": "1000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "SI Brochure Table 7: milli = 1e-3 applied to candela"
        }
      ],
      "scope": "Explicit unit scale. Luminous flux/intensity/illuminance conversion still requires geometry; activity is not equivalent dose or cyclic frequency.",
      "legacy_tools": [],
      "systems": [
        "si_decimal"
      ],
      "family_id": "luminous_intensity.cd",
      "usage_status": "current"
    },
    {
      "unit_id": "cx:lm_W",
      "slug": "lumen-per-watt",
      "name": "Lumen per watt",
      "symbol": "lm/W",
      "code": "lm_W",
      "aliases": [],
      "quantity_kind": "luminous_efficacy",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "reference",
        "reference_unit": "cx:lm_W",
        "scale": {
          "numerator": "1",
          "denominator": "1"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Photometric luminous efficacy. Watt-to-lumen conversion requires an efficacy or spectral/photometric model; this unit does not imply a universal factor.",
      "legacy_tools": [],
      "systems": [
        "si_coherent"
      ],
      "family_id": "luminous_efficacy.lm_w",
      "usage_status": "current",
      "expression": {
        "cx:lm": 1,
        "cx:W": -1
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    },
    {
      "unit_id": "cx:ppm_K",
      "slug": "part-per-million-per-kelvin-difference",
      "name": "Part per million per kelvin difference",
      "symbol": "ppm/K",
      "code": "ppm_K",
      "aliases": [],
      "quantity_kind": "temperature_coefficient",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:per_K",
        "scale": {
          "numerator": "1",
          "denominator": "1000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
        }
      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Temperature factors are differences (intervals), explicitly declared in expression_roles. Absolute temperature offsets do not participate. Definition metadata, not a claim that an existing calculator is migrated.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "temperature_coefficient.per_k",
      "usage_status": "current",
      "expression": {
        "cx:ppm": 1,
        "cx:K": -1
      },
      "expression_roles": {
        "cx:K": "interval"
      }
    },
    {
      "unit_id": "cx:ppm_delta_degC",
      "slug": "part-per-million-per-celsius-difference",
      "name": "Part per million per Celsius difference",
      "symbol": "ppm/°C",
      "code": "ppm_delta_degC",
      "aliases": [],
      "quantity_kind": "temperature_coefficient",
      "owner_pack": "core.metrology",
      "revision": "1.0.0",
      "lifecycle": "candidate",
      "definition_exactness": "exact_definition",
      "transform": {
        "type": "linear",
        "reference_unit": "cx:per_K",
        "scale": {
          "numerator": "1",
          "denominator": "1000000"
        },
        "offset": {
          "numerator": "0",
          "denominator": "1"
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      },
      "source_refs": [
        {
          "source_id": "source:bipm-si-9-v4.01",
          "locator": "Tables 4–7: coherent derived units, unit algebra and decimal prefixes"
        }
      ],
      "scope": "Temperature factors are differences (intervals), explicitly declared in expression_roles. Absolute temperature offsets do not participate. Definition metadata, not a claim that an existing calculator is migrated.",
      "legacy_tools": [],
      "systems": [
        "other"
      ],
      "family_id": "temperature_coefficient.per_k",
      "usage_status": "current",
      "expression": {
        "cx:ppm": 1,
        "cx:degC": -1
      },
      "expression_roles": {
        "cx:degC": "interval"
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}