{
  "url": "https://openlegislation.uk/units-of-measurement-regulations-2009/regulation-4",
  "json_url": "https://openlegislation.uk/units-of-measurement-regulations-2009/regulation-4.json",
  "legislation": "uksi/2009/3046",
  "legislation_title": "The Units of Measurement Regulations 2009",
  "legislation_url": "https://openlegislation.uk/units-of-measurement-regulations-2009",
  "path": "regulation/4",
  "kind": "regulation",
  "number": "4",
  "heading": "Further amendments of the 1986 Regulations",
  "text": "(1) The 1986 Regulations are further amended as follows.\n(2) In Schedule 1—\n(a) in paragraph 1—\n(i) at the end of the entry beginning “The kelvin” insert “This definition refers to water having the isotopic composition defined by the following amount-of-substance ratios: 0.00015576 mole of ²H per mole of ¹H, 0.0003799 mole of 17O per mole of 16O and 0.0020052 mole of 18O per mole of 16O.”; and\n(ii) in the italic heading “Special name and symbol of the SI unit of temperature for expressing Celsius temperature”, for “SI unit” substitute “SI derived unit”;\n(b) in paragraph 2—\n(i) for the italic heading “Other SI units” substitute “SI derived units”;\n(ii) omit sub-paragraph (1);\n(iii) for sub-paragraph (2) substitute—\n“(2) General rule for SI derived units\nUnits derived coherently from SI base units are given as algebraic expressions in the form of products of powers of the SI base units with a numerical factor equal to 1.”;and\n(iv) for sub-paragraph (3) substitute the table and the notes set out in the Schedule.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2009/3046/regulation/4",
    "retrieved_at": "2026-10-29T03:01:17.708413+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}