Isothermal / Adiabatic / Polytropic Process Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t2-024

Effect

Computation or source lookup only

Input and validation requirements

The adiabatic formula is undefined at gamma = 1 because its denominator gamma - 1 vanishes. If the calculator accepts gamma = 1 instead of rejecting it, it may emit NaN, Infinity, or an inconsistent result.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "process_type": "isothermal",
    "n_moles": 1,
    "T1_K": 300,
    "V1_m3": 0.01,
    "V2_m3": 0.02,
    "R_J_per_molK": 8.314
  },
  "expected_outputs": {
    "P1_Pa": 249420,
    "P2_Pa": 124710,
    "T2_K": 300,
    "work_by_gas_J": 1728.85,
    "heat_into_gas_J": 1728.85,
    "delta_U_J": 0
  },
  "working": "P1=nRT/V1=(1×8.314×300)/0.01=249420 Pa. P2=nRT/V2=(1×8.314×300)/0.02=124710 Pa. T2=T1=300 K. W=nRT ln(V2/V1)=(1×8.314×300)ln(0.02/0.01)=2494.2×ln(2)=2494.2×0.69314718=1728.85 J. For an ideal-gas isothermal process, ΔU=0, so Q=W=1728.85 J."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche2/tranche2-results.json