Source: https://guthlabs.ai/docs/instruments/chemistry-unit-constants-converter/implementation/

instrument implementation / implementation-contract

# Chemistry Unit & Constants Converter implementation

A source-bound implementation contract for Chemistry Unit & Constants Converter; 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**: t6-139

**Effect**: Computation or source lookup only

## Input and validation requirements

An unrecognized constant name produces an undefined lookup result and must be rejected explicitly. In addition, an unqualified pressure input cannot distinguish absolute pressure from gauge pressure without a convention warning.

## 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": {
    "value": 1,
    "from_unit": "atm",
    "to_units": [
      "kPa",
      "mmHg",
      "torr",
      "bar"
    ]
  },
  "expected_outputs": {
    "kPa": 101.325,
    "mmHg": 760,
    "torr": 760,
    "bar": 1.01325
  },
  "working": "1 atm × (101.325 kPa/atm) = 101.325 kPa. 1 atm × (760 mmHg/atm) = 760 mmHg. 1 atm × (760 torr/atm) = 760 torr. 1 atm × (101.325 kPa/atm) × (1 bar/100 kPa) = 1.01325 bar."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/chemistry-unit-constants-converter/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/chemistry-unit-constants-converter/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/chemistry-unit-constants-converter/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`