Unit & Dimensional Analysis Converter mechanism

Model scope

The core algorithm is standard: multiplicative factors for units sharing a dimension, affine formulas for offset temperature scales, and exponent-vector tracking for dimensions. Verdict is NEEDS_REVIEW because the exact unit inventory, factor-table version/precision, dimensional-expression interface, and temperature-difference behavior are not specified.

• The stated linear/affine conversion method is standard, but the supported-unit lookup table, factor precision, and reference/version are unspecified, so exact reproducibility cannot be verified.
• Dimensional-consistency checking is claimed, but the input schema only defines a scalar value, source unit, and target unit; it does not define an expression grammar, compound-unit syntax, or how dimension exponents are supplied and reported.
• Temperature conversions must distinguish absolute temperatures from temperature differences: Celsius/Fahrenheit/Kelvin require affine offsets, while temperature intervals require multiplicative-only factors.
• The specification does not state whether compound units such as m/s^2, prefixes, reciprocal units, or derived SI units are supported.

Units and conventions

• Length conversion uses the exact SI definition 1 in = 0.0254 m.
• Mass conversion uses 1 kg = 2.20462262184878 lb; the pound is assumed to mean the avoirdupois international pound.
• Time conversion uses 1 h = 60 min.
• Absolute temperature conversion uses K = °C + 273.15; Kelvin and Celsius increments are assumed equal in size.
• Dimension exponents use SI base dimensions, with L for length, M for mass, T for time, and Θ for thermodynamic temperature.

Inspectable vector

One of 4 source-bound review vectors:

{
  "inputs": {
    "value": 12,
    "source_unit": "in",
    "target_unit": "m"
  },
  "expected_outputs": {
    "converted_value": 0.3048,
    "dimension_breakdown": {
      "L": 1,
      "M": 0,
      "T": 0,
      "Theta": 0
    }
  },
  "working": "1. Use the exact factor: 1 in = 0.0254 m.\n2. Convert: 12 in × 0.0254 m/in = 0.3048 m.\n3. The inch and metre are both length units, so the dimension exponents are L^1 M^0 T^0 Θ^0."
}

Failure boundary

BREAK_CLAIMED · SELF_FLAGGED

An extreme but syntactically valid finite input, 1e308 m, converts to 1e311 mm and overflows JavaScript Number arithmetic to Infinity. The converter should reject or clearly flag the non-finite output. The pound test also exposes a convention-dependent result if lb is not disambiguated.

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-tranche6/tranche6-results.json
• BOUNDARY_HAZARD_CATALOG.json