Source: https://guthlabs.ai/docs/instruments/kitchen-unit-volume-weight-converter/
instrument / verified-clean
# Kitchen Unit & Volume-Weight Converter
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]()[02**Mechanism**Method and assumptions]()[03**Implementation**Binding and validation]()[04**Qualification**Evidence and errata]()
## Ledger state
The current ledger marks this instrument verified clean within the source-bound verification corpus.
**Area**: Everyday & Life
**Tranche**: tranche-7
**Evidence ID**: t7-009
**Ledger rows**: 1
No ledger note is attached.
## Review findings
The stated volume-to-mass formula is standard under consistent units, but the instrument specification is incomplete for the advertised all-unit conversion set. It needs explicit unit definitions, mass-to-mass and volume-to-volume conversion algorithms, and a versioned ingredient table with preparation-state labels. The honest-label warning is appropriate but should be displayed with the selected ingredient and result.
### Formula and scope findings
- mass = volume × density is correct for volume-to-mass conversion when volume and density use compatible units, but it does not by itself define mass-to-mass conversions such as oz to g or lb to g.
- The specification does not define the volume-unit conversion constants for cup, tbsp, tsp, mL, and L, nor the mass-unit conversion constants for oz, g, and lb.
- A density lookup is insufficient unless the table specifies the exact ingredient form and preparation state, such as sifted versus spooned-and-leveled flour, packed brown sugar, or softened versus melted butter.
- The density-table sourcing is underspecified: USDA FoodData Central and King Arthur weight charts may provide serving weights rather than a single universal density, and their values should not be silently treated as interchangeable.
### Unit assumptions
- cup means US culinary cup = 240 mL; tbsp = 15 mL; tsp = 5 mL; L = 1000 mL.
- oz means avoirdupois mass ounce, not US fluid ounce; 1 oz = 28.349523125 g.
- 1 lb means avoirdupois pound; 1 lb = 453.59237 g.
- Densities are treated as approximate culinary densities in g/mL at ordinary room temperature; actual food density varies with brand, temperature, packing, humidity, and processing.
- Water uses the common culinary approximation 1.000 g/mL rather than the temperature-specific thermodynamic density of water.
## Boundary hardening
**BREAK_CLAIMED** · SELF_FLAGGED
A zero-density table record produces an undefined mass-to-volume calculation, and an unqualified oz unit permits materially different weight-ounce and fluid-ounce results.
## 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": {
"ingredient": "water",
"quantity": 1,
"from_unit": "cup",
"to_unit": "g"
},
"expected_outputs": {
"quantity": 240,
"unit": "g"
},
"reference_data": {
"cup_to_mL": 240,
"source_convention": "widely tabulated standard culinary US-cup value",
"water_density_g_per_mL": 1,
"density_source_convention": "widely tabulated standard culinary value; water approximated as 1 g/mL"
},
"working": "1 cup × 240 mL/cup = 240 mL.\nMass = volume × density = 240 mL × 1.000 g/mL = 240 g."
}
````
## 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-tranche7/tranche7-results.json`
- `BOUNDARY_HAZARD_CATALOG.json`