Source: https://guthlabs.ai/docs/instruments/unit-converter-physics-quantities/implementation/

instrument implementation / implementation-contract

# Unit Converter — Physics Quantities implementation

A source-bound implementation contract for Unit Converter — Physics Quantities; 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**: t6-138

**Effect**: Computation or source lookup only

## Input and validation requirements

An extreme but representable input value, 1e308 J, converts mathematically to approximately 6.241509074460763e326 eV and overflows a JavaScript IEEE-754 Number to Infinity. The calorie probe also exposes a convention-dependent result if the lookup table does not specify the calorie definition.

## 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": {
    "quantity_type": "energy",
    "value": 0,
    "from_unit": "cal",
    "to_unit": "J",
    "calorie_convention": "thermochemical"
  },
  "expected_outputs": {
    "value": 0,
    "unit": "J"
  },
  "working": "1. Apply the linear conversion: J = cal × 4.184 J/cal. 2. J = 0 × 4.184 = 0 J. This is an edge case and gives the same result for any calorie convention."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/unit-converter-physics-quantities/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/unit-converter-physics-quantities/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/unit-converter-physics-quantities/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-tranche6/tranche6-results.json`