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    "Series R=ΣR_i; parallel 1/R=Σ1/R_i; Q=ΔT/R",
    "Not Fourier/Newton Q pages",
    "Not heatsink θ, not steam, not radiation"
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    "Series R=ΣR_i; parallel 1/R=Σ1/R_i; Q=ΔT/R when ΔT is given",
    "Not Fourier/Newton Q (see /calc/physics/heat-transfer)",
    "Not heatsink θJC/θSA, not steam, not radiation"
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  "boundary_conditions": [
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    "k, A, L, h, or R ≤ 0 → VALUE_MUST_BE_POSITIVE",
    "conduction with h, or convection with k/L, or resistances[] with R1… → MIXED_INPUT_ENCODING",
    "heat-transfer, heatsink, radiation, or steam as mode → INVALID_MODE"
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      "title": "Incropera, F.P. and DeWitt, D.P. Fundamentals of Heat and Mass Transfer",
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      "supports": "R_cond = L/(k A); R_conv = 1/(h A); series and parallel combination; Q = ΔT/R",
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      "section": "Heat rate and temperature difference",
      "url": "https://www.iso.org/standard/30675.html",
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    {
      "id": "boundary-rth-missing",
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      "expectError": "MISSING_REQUIRED_INPUT",
      "code": "MISSING_REQUIRED_INPUT",
      "error": "k is required"
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    {
      "id": "boundary-rth-k0",
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        "L": 0.5
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    {
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        "A": 2,
        "L": 0.5,
        "h": 10
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