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

instrument mechanism / verified-clean

# Ideal Gas Law Calculator mechanism

The inspectable method record for Ideal Gas Law Calculator, kept separate from implementation and qualification.

Status: **VERIFIED_CLEAN**Lifecycle: **verified-clean**

## Model scope

PV=nRT is the correct ideal-gas equation, and its rearrangements correctly solve for any one missing variable when the other three values, units, and R are valid. Verdict is NEEDS_REVIEW because the spec does not define input units, absolute-temperature requirements, absolute-pressure requirements, or physical-domain constraints.

No additional formula finding is recorded.

## Units and conventions

- P, V, n, and T must use mutually consistent units with R.

- Using R=0.08206 requires P in atm, V in L, n in mol, and T in K.

- Using R=8.314 requires P in Pa, V in m^3, n in mol, and T in K.

- Temperature must be absolute Kelvin, not Celsius.

- Pressure must be absolute pressure, not gauge pressure.

- The supplied R values are rounded approximations; labeling both simply as CODATA is imprecise, especially for 8.314 J/(mol·K).

## Inspectable vector

One of 4 source-bound review vectors:

````
{
  "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."
}
````

## Failure boundary

**BREAK_CLAIMED** · SELF_FLAGGED

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.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/ideal-gas-law-calculator/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/ideal-gas-law-calculator/implementation/>)[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`

- `BOUNDARY_HAZARD_CATALOG.json`