Source: https://guthlabs.ai/docs/instruments/ideal-gas-law-calculator/implementation/

instrument implementation / implementation-contract

# Ideal Gas Law Calculator implementation

A source-bound implementation contract for Ideal Gas Law Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t4-123

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification does not state validation for absolute-zero inputs, zero-mole division traps, unit-system branch selection, or Celsius-versus-Kelvin temperature interpretation. A plain-arithmetic implementation can return undefined/NaN or materially wrong results instead of rejecting or disambiguating these cases.

## 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": {
    "n": 2,
    "n_unit": "mol",
    "T": 300,
    "T_unit": "K",
    "V": 10,
    "V_unit": "L",
    "R": 0.08206,
    "R_unit": "L·atm/(mol·K)"
  },
  "expected_outputs": {
    "P": 4.9236,
    "P_unit": "atm"
  },
  "working": "P = nRT/V = (2 mol × 0.08206 L·atm/(mol·K) × 300 K) / 10 L = 49.236 L·atm / 10 L = 4.9236 atm."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/ideal-gas-law-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/ideal-gas-law-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/ideal-gas-law-calculator/qualification/>)

## 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`