Source: https://guthlabs.ai/docs/instruments/beer-lambert-law-absorbance-calculator/implementation/

instrument implementation / implementation-contract

# Beer–Lambert Law (Absorbance) Calculator implementation

A source-bound implementation contract for Beer–Lambert Law (Absorbance) 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**: t5-014

**Effect**: Computation or source lookup only

## Input and validation requirements

The zero-path-length input makes the concentration calculation undefined. With the specified plain-arithmetic engine, an unchecked implementation can return Infinity rather than rejecting the input. Unit ambiguity can additionally produce a tenfold concentration error.

## 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": {
    "A": 0.6,
    "epsilon": 15000,
    "epsilon_units": "L mol^-1 cm^-1",
    "l": 1,
    "l_units": "cm",
    "c": null,
    "c_units": "mol L^-1"
  },
  "expected_outputs": {
    "c": 0.00004,
    "c_units": "mol L^-1"
  },
  "working": "c=A/(εl)=0.600/(15000×1)=0.600/15000=0.0000400 mol L^-1=4.00×10^-5 mol L^-1."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/beer-lambert-law-absorbance-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/beer-lambert-law-absorbance-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/beer-lambert-law-absorbance-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-tranche5/tranche5-results.json`