{
  "name": "Which defining constants each SI base unit uses",
  "desc": "One row per SI base unit: the defining constants its 2019 definition uses, directly or through the second, meter and kilogram, and the earlier definition that was abrogated.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "The Yardstick Almanac",
  "url": "https://theyardstickalmanac.com/units/kilogram-definition/",
  "from": [
    "CGPM, 26th meeting (2018), Resolution 1, On the revision of the International System of Units (SI), in force from 20 May 2019",
    "BIPM, The International System of Units (SI), 9th edition, version 4.01 (June 2026), CC BY 4.0"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "Traced from the base-unit definitions in CGPM Resolution 1 (2018) and the SI Brochure, 9th edition, version 4.01, by the BIPM, CC BY 4.0 (adapted); 2026-11-01"
  ]
}