Combined/Combined-Gas-Law 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

t4-135

Effect

Computation or source lookup only

Input and validation requirements

The specification exposes invalid-input hazards at T=0 K and when P1*V1=0; these require rejection or an explicit undefined result. Pressure gauge-versus-absolute interpretation can also produce materially different outputs if the convention is not specified.

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": {
    "P1": 1,
    "V1": 2,
    "T1": 300,
    "V2": 1.5,
    "T2": 330,
    "pressure_unit": "atm",
    "volume_unit": "L",
    "temperature_unit": "K",
    "missing": "P2"
  },
  "expected_outputs": {
    "P2": 1.4666667,
    "pressure_unit": "atm"
  },
  "working": "P1V1/T1 = P2V2/T2. Rearrange: P2 = P1V1T2/(T1V2). Substitute: P2 = (1.00 atm × 2.00 L × 330 K)/(300 K × 1.50 L) = 660/450 atm = 1.4666667 atm."
}

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-tranche4/tranche4-results.json