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

instrument / verified-clean

# Ideal Gas Law Calculator

The current ledger marks this instrument verified clean within the source-bound verification corpus.

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

## Inspectable records

[01**Overview**Purpose and lifecycle](<https://guthlabs.ai/docs/instruments/ideal-gas-law-calculator/>)[02**Mechanism**Method and assumptions](<https://guthlabs.ai/docs/instruments/ideal-gas-law-calculator/mechanism/>)[03**Implementation**Binding and validation](<https://guthlabs.ai/docs/instruments/ideal-gas-law-calculator/implementation/>)[04**Qualification**Evidence and errata](<https://guthlabs.ai/docs/instruments/ideal-gas-law-calculator/qualification/>)

## Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

**Area**: Chemistry & Materials

**Tranche**: tranche-4

**Evidence ID**: t4-123

**Ledger rows**: 1

No ledger note is attached.

## Review findings

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.

### Formula and scope findings

No additional record

### Unit assumptions

- 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).

## Boundary hardening

**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.

## Errata and corrections

No applied erratum is attached to this unique-name record.

## Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

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

## Related workflows

No source-defined multi-instrument workflow membership is recorded.

## Sources and evidence

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

- `VERIFIED_LEDGER.json · VERIFIED_CLEAN`

- `evidence-tranche4/tranche4-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`