{
  "name": "Four values that became measured on May 20, 2019",
  "desc": "One row per quantity in Appendix 2 of CGPM Resolution 1: its exact value under the old definitions, its relative standard uncertainty from May 20, 2019, and that uncertainty in its own unit.",
  "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"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "CGPM Resolution 1 (2018), Appendix 2, by the BIPM, CC BY 4.0 (adapted: uncertainties in each quantity's own unit computed); 2026-11-01"
  ]
}