CVP verified calculation capability
ISO 5167-4 classical Venturi tube Q=C E A2 √(2Δp/ρ) with C from convergent type. Not given C_d=0.98, not ISA 1932, not RHG orifice, not Q=Av, not Darcy.
Physics · Fluid Capability ID physics.fluid.iso_venturi version 1.0.0 CVP VERIFIED CURRENT Engineering
Discharge
Q = C E A2 √(2Δp / ρ)β = D2/D1 · E = 1/√(1 − β⁴)C = 0.995 (ISO 5167-4 machined convergent)Modes: flow · pressure · coefficient
Canonical symbols for this capability. Agent schemas remain the contract.
| Symbol | Quantity | Unit | Role |
|---|---|---|---|
D1 | Inlet diameter in m | — | input / output |
D2 | Throat diameter in m | — | input / output |
beta | D2/D1 | — | input / output |
Re_D | Pipe Reynolds number on D1 | — | input / output |
kind | machined | — | input / output |
dP | Inlet-to-throat differential pressure in Pa | — | input / output |
rho | Density in kg/m³ | — | input / output |
Q | Volume flow in m³/s | — | input / output |
E | — | — | output |
A1 | — | — | output |
A2 | — | — | output |
C | — | — | output |
Cd | — | — | output |
v1 | — | — | output |
v2 | — | — | output |
model | — | — | output |
Declared scope for this capability. Do not use it outside this domain.
Assumptions
Not supported
One numerical check. The calculator page holds worked steps and FAQ.
D1=0.1 D2=0.05 Re_D=5e5 dP=10000 rho=1000 machined → C=0.995 Q≈0.009024
CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance · Q = C E A2 √(2Δp/ρ) with ISO 5167-4 type C; plus pressure and coefficient solves; + O3 mpmath tabulated discharge.. Computational verification is defined by CVP. Supplemental domain review (internal) and named expert review are defined by the Review policy and do not by themselves determine CVP conformance.
Human page, REST, and MCP share the same engine and calculation_version.
Build verified hashes workspace artifacts only. After deploy, attest:production GETs canonical URLs twice — the public/cached view an Agent actually hits, and origin — including every /capabilities/{id} HTML page. Public Capability HTML version must match catalog before production attestation passes. Live Trust rows above fetch /.well-known/calculatorx-production-attestation.json
and the output schema const. Build hashes: release integrity. That proves currently published page / engine / schema / evidence / MCP agree — not that a historical version is independently immutable. Reference Calculation Standard — Production surface contract 6/6.
curl -sS -X POST 'https://www.calculatorx.com/api/v1/calc/iso-venturi' \
-H 'Content-Type: application/json' \
-d '{"inputs":{"D1":0.1,"D2":0.05,"Re_D":500000,"dP":10000,"rho":1000},"calculation_version":"1.0.0"}'{
"inputs": {
"D1": 0.1,
"D2": 0.05,
"Re_D": 500000,
"dP": 10000,
"rho": 1000
},
"calculation_version": "1.0.0"
}POST /api/v1/calc/iso-venturi. This is a POST calculate endpoint — do not GET it.
Full REST contract: REST API docs.
Human-readable sources plus CVP reference evidence classes.
Sources
Reference evidence classes: O1 model · O3 expected_values · O3 numerical_behavior · O2 expected_values · O2 numerical_behavior
Inspect, then execute. Same engine as REST and the human calculator.
curl -sS -X POST 'https://www.calculatorx.com/mcp' \
-H 'Content-Type: application/json' \
-H 'MCP-Protocol-Version: 2026-07-28' \
-H 'Mcp-Method: tools/call' \
-H 'Mcp-Name: inspect_capability' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"inspect_capability","arguments":{"capability_id":"physics.fluid.iso_venturi"},"_meta":{"io.modelcontextprotocol/protocolVersion":"2026-07-28","io.modelcontextprotocol/clientInfo":{"name":"calculatorx-docs-example","version":"1.0.0"},"io.modelcontextprotocol/clientCapabilities":{}}}}'curl -sS -X POST 'https://www.calculatorx.com/mcp' \
-H 'Content-Type: application/json' \
-H 'MCP-Protocol-Version: 2026-07-28' \
-H 'Mcp-Method: tools/call' \
-H 'Mcp-Name: execute_calculation' \
-d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"execute_calculation","arguments":{"capability_id":"physics.fluid.iso_venturi","inputs":{"D1":0.1,"D2":0.05,"Re_D":500000,"dP":10000,"rho":1000},"calculation_version":"1.0.0"},"_meta":{"io.modelcontextprotocol/protocolVersion":"2026-07-28","io.modelcontextprotocol/clientInfo":{"name":"calculatorx-docs-example","version":"1.0.0"},"io.modelcontextprotocol/clientCapabilities":{}}}}'Pin calculation_version (1.0.0) when the result must stay reproducible.
Inspect the trust tier and required assurance level before execution. Full protocol notes: MCP docs.