{
  "url": "https://openlegislation.uk/units-of-measurement-regulations-2009/schedule",
  "json_url": "https://openlegislation.uk/units-of-measurement-regulations-2009/schedule.json",
  "legislation": "uksi/2009/3046",
  "legislation_title": "The Units of Measurement Regulations 2009",
  "legislation_url": "https://openlegislation.uk/units-of-measurement-regulations-2009",
  "path": "schedule",
  "kind": "schedule",
  "number": null,
  "heading": "Substituted paragraph 2(3) for Schedule 1 to the Units of Measurement Regulations 1986",
  "text": "“(3) SI derived units with special names and symbols\nQuantity\nUnit Name\nUnit Symbol\nExpression in terms of other SI units\nExpression in terms of SI base units\nPlane angle\nradian\nrad\nm.m-1\nSolid angle\nsteradian\nsr\nm2.m-2\nFrequency\nHertz\nHz\ns-1\nForce\nnewton\nN\nm.kg.s-2\nPressure, stress\npascal\nPa\nN.m-2\nm-1.kg.s-2\nEnergy, work, quantity of heat\nJoule\nJ\nN.m\nm2.kg.s-2\nPower*, radiant flux\nWatt\nW\nJ.s-1\nm2.kg.s-3\nElectric charge, quantity of electricity\ncoulomb\nC\ns.A\nElectric potential, potential difference, electromotive force\nVolt\nV\nW.A-1\nm2.kg.s-3.A-1\nElectric resistance\nOhm\nΩ\nV.A-1\nm2.kg.s-3.A-2\nConductance\nsiemens\nS\nA.V-1\nm-2.kg-1.s3.A2\nCapacitance\nFarad\nF\nC.V-1\nm-2.kg-1.s4.A2\nMagnetic flux\nweber\nWb\nV.s\nm2.kg.s-2.A-1\nMagnetic flux density\nTesla\nT\nWb.m-2\nkg.s-2.A-1\nInductance\nHenry\nH\nWb.A-1\nm2.kg.s-2.A-2\nLuminous flux\nlumen\nlm\ncd.sr\ncd\nIlluminance\nLux\nlx\nlm.m-2\nm-2.cd\nActivity (of a radionuclide)\nbecquerel\nBq\ns-1\nAbsorbed dose, specific energy imparted, kerma, absorbed dose index\nGray\nGy\nJ.kg-1\nm2.s-2\nDose equivalent, dose equivalent index\nsievert\nSv\nJ.kg-1\nm2.s-2\nCatalytic activity\nKatal\nkat\nmol.s-1\nNotes\nUnits derived from SI base units may be expressed in terms of the units listed in this Schedule.\nIn particular, SI derived units may be expressed by the special names and symbols given in the above table; for example, the SI unit of dynamic viscosity may be expressed as m-1. kg.s-1 or N.s.m-2 or Pa.s.\n*Special names for the unit of power: the name volt-ampere (symbol “VA”) when it is used to express the apparent power of alternating electric current, and var (symbol “var”) when it is used to express reactive electric power.”",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2009/3046/schedule",
    "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."
}