Kitchen Unit & Volume-Weight Converter mechanism

Model scope

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.

• 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.

Units and conventions

• 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.

Inspectable vector

One of 4 source-bound review vectors:

{
  "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."
}

Failure boundary

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.

Other records

Sources and evidence

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

• VERIFIED_LEDGER.json
• evidence-tranche7/tranche7-results.json
• BOUNDARY_HAZARD_CATALOG.json