{
  "name": "Solveberry Unit Definitions",
  "version": "2026-09-14",
  "license": "CC0-1.0",
  "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
  "reviewed": "2026-09-14",
  "notes": "Machine-readable reference definitions used for transparent conversion methodology. Exactness is stated per record. Cooking conventions are labeled separately from physical unit definitions.",
  "sources": {
    "nist_b8": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8",
    "nist_metric_kitchen": "https://www.nist.gov/pml/owm/metric-si/metric-kitchen/metric-kitchen-cooking-measurement-equivalencies",
    "bipm_si": "https://www.bipm.org/en/publications/si-brochure"
  },
  "units": [
    {"id":"inch","symbol":"in","quantity":"length","base_unit":"meter","factor":0.0254,"exact":true,"basis":"International yard and pound agreement; NIST conversion factors","source":"nist_b8"},
    {"id":"foot","symbol":"ft","quantity":"length","base_unit":"meter","factor":0.3048,"exact":true,"basis":"12 inches","source":"nist_b8"},
    {"id":"yard","symbol":"yd","quantity":"length","base_unit":"meter","factor":0.9144,"exact":true,"basis":"3 feet","source":"nist_b8"},
    {"id":"mile","symbol":"mi","quantity":"length","base_unit":"meter","factor":1609.344,"exact":true,"basis":"1760 yards","source":"nist_b8"},
    {"id":"pound","symbol":"lb","quantity":"mass","base_unit":"kilogram","factor":0.45359237,"exact":true,"basis":"International avoirdupois pound","source":"nist_b8"},
    {"id":"ounce","symbol":"oz","quantity":"mass","base_unit":"kilogram","factor":0.028349523125,"exact":true,"basis":"1/16 pound","source":"nist_b8"},
    {"id":"liter","symbol":"L","quantity":"volume","base_unit":"cubic_meter","factor":0.001,"exact":true,"basis":"SI-accepted unit","source":"bipm_si"},
    {"id":"milliliter","symbol":"mL","quantity":"volume","base_unit":"cubic_meter","factor":0.000001,"exact":true,"basis":"1/1000 liter","source":"bipm_si"},
    {"id":"us_gallon","symbol":"US gal","quantity":"volume","base_unit":"liter","factor":3.785411784,"exact":true,"basis":"231 cubic inches","source":"nist_b8"},
    {"id":"us_fluid_ounce","symbol":"US fl oz","quantity":"volume","base_unit":"milliliter","factor":29.5735295625,"exact":true,"basis":"1/128 US gallon","source":"nist_b8"},
    {"id":"us_cup","symbol":"US cup","quantity":"volume","base_unit":"milliliter","factor":236.5882365,"exact":true,"basis":"8 US fluid ounces","source":"nist_b8"},
    {"id":"us_tablespoon","symbol":"US tbsp","quantity":"volume","base_unit":"milliliter","factor":14.78676478125,"exact":true,"basis":"1/16 US cup","source":"nist_b8"},
    {"id":"us_teaspoon","symbol":"US tsp","quantity":"volume","base_unit":"milliliter","factor":4.92892159375,"exact":true,"basis":"1/3 US tablespoon","source":"nist_b8"},
    {"id":"imperial_gallon","symbol":"Imp gal","quantity":"volume","base_unit":"liter","factor":4.54609,"exact":true,"basis":"Imperial gallon definition","source":"nist_b8"},
    {"id":"imperial_fluid_ounce","symbol":"Imp fl oz","quantity":"volume","base_unit":"milliliter","factor":28.4130625,"exact":true,"basis":"1/160 Imperial gallon","source":"nist_b8"},
    {"id":"metric_cooking_cup","symbol":"metric cup","quantity":"cooking_volume","base_unit":"milliliter","factor":250,"exact":false,"basis":"Common metric cooking convention","source":"nist_metric_kitchen"},
    {"id":"metric_cooking_tablespoon","symbol":"metric tbsp","quantity":"cooking_volume","base_unit":"milliliter","factor":15,"exact":false,"basis":"Common metric cooking convention","source":"nist_metric_kitchen"},
    {"id":"metric_cooking_teaspoon","symbol":"metric tsp","quantity":"cooking_volume","base_unit":"milliliter","factor":5,"exact":false,"basis":"Common metric cooking convention","source":"nist_metric_kitchen"}
  ]
}