Graham's Law Effusion/Diffusion 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

t4-171

Effect

Computation or source lookup only

Input and validation requirements

The specification permits an input with zero molar mass even though it makes the square-root argument undefined, so the calculator requires explicit domain rejection. It also leaves the direction of the reported rate ratio dependent on gas labeling, creating a convention hazard.

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": {
    "gas1": "H2",
    "M1_g_per_mol": 2,
    "gas2": "O2",
    "M2_g_per_mol": 32,
    "known_rate1_L_per_s": 8,
    "known_time1_s": 10
  },
  "expected_outputs": {
    "rate_ratio_rate1_over_rate2": 4,
    "rate2_L_per_s": 2,
    "time2_s": 40
  },
  "working": "M2/M1 = 32/2 = 16; sqrt(16) = 4, so rate1/rate2 = 4. rate2 = rate1/4 = 8/4 = 2 L/s. For equal gas quantities, t2 = t1*sqrt(M2/M1) = 10*4 = 40 s."
}

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