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S.I. No. 154/2020 - European Communities (Units of Measurement) (Amendment) Regulations 2020

S.I. No. 154/2020 - European Communities (Units of Measurement) (Amendment) Regulations 2020 Skip to content Disclaimer Feedback Helpdesk Gaeilge Léim go dtí an t-ábhar Séanadh Aiseolas Deasc chabhrach English Gaeilge English Produced by the Office of the Attorney General Táirgthe ag Oifig an Ard-Aighne Home Legislation Acts of the Oireachtas Statutory Instruments Pre-1922 Legislation Constitution External Resources Bills (Houses of the Oireachtas) Iris Oifigiúil / Official Gazette Revised Acts (LRC) Classified List of Legislation (LRC) Translations (acts.

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  3. s)or rangeBliain nó blianta nó raon TypeCineál All Legislation Acts Statutory Instruments Advanced SearchCuardach Casta HomeBaile Statutory InstrumentsIonstraimí Reachtúla 2020 S.I. No. 154/2020 - European Communities (Units of Measurement) (Amendment) Regulations 2020 S.I. No. 154/2020 - European Communities (Units of Measurement) (Amendment) Regulations 2020 AmendmentsLeasuithe Download PDF Íoslódáil PDF Notice of the making of this Statutory Instrument was published in “Iris Oifigiúil” of 5th May, 2020. I, HEATHER HUMPHREYS, Minister for Business, Enterprise and Innovation, in exercise of the powers conferred on me by section 3 of the European Communities Act 1972 (No. 27 of 1972) and for the purpose of giving effect to Council Directive 80/181/EEC of 20 December 19791 as last amended by Directive 2019/1258/EU of the European Parliament and of the Council of 23 July 20192 , hereby make the following Regulations: Citation and Commencement 1.

(1)These Regulations may be cited as the European Communities (Units of Measurement) (Amendment) Regulations 2020.
(2)These Regulations come into operation on 13 June
  1. Interpretation
  2. In these Regulations— “Principal Regulations” means the European Communities (Units of Measurement) Regulation 1992 ( S.I. No. 255 of 1992 );
  3. Section 1.1 of Schedule 1 of the Principal Regulations is replaced by the following— ‘1.
  4. SI base units Quantity Unit Name Symbol Time second s Length metre m Mass kilogram kg Electric current ampere A Thermodynamic temperature kelvin K Amount of substance mole mol Luminous intensity candela cd Definitions of SI base units: Unit of time The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency Δv Cs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s–
  5. Unit of length The metre, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m/s, where the second is defined in terms of Δv Cs. Unit of mass The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6,626 070 15 * 10– 34 when expressed in the unit J s, which is equal to kg m2 s– 1, where the metre and the second are defined in terms of c and Δv Cs. Unit of electric current The ampere, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the elementary charge e to be 1,602 176 634 * 10– 19 when expressed in the unit C, which is equal to A s, where the second is defined in terms of Δv Cs. Unit of thermodynamic temperature The kelvin, symbol K, is the SI unit of thermodynamic temperature. It is defined by taking the fixed numerical value of the Boltzmann constant k to be 1,380 649 * 10– 23 when expressed in the unit J K– 1, which is equal to kg m2 s– 2 K– 1, where the kilogram, metre and second are defined in terms of h, c and Δv Cs. Unit of amount of substance The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6,022 140 76 * 1023 elementary entities. This number is the fixed numerical value of the Avogadro constant, N A, when expressed in the unit mol– 1 and is called the Avogadro number. The amount of substance, symbol n, of a system is a measure of the number of specified elementary entities. An elementary entity may be an atom, a molecule, an ion, an electron, any other particle or specified group of particles. Unit of luminous intensity The candela, symbol cd, is the SI unit of luminous intensity in a given direction. It is defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540 * 1012 Hz, K cd, to be 683 when expressed in the unit lm W– 1, which is equal to cd sr W– 1, or cd sr kg– 1 m– 2 s3, where the kilogram, metre and second are defined in terms of h, c and Δv Cs. 1.1.
  6. Special name and symbol of the SI derived unit of temperature for expressing Celsius temperature Quantity Unit Name Symbol Celsius temperature degree Celsius °C Celsius temperature t is defined as the difference t = T – T0 between the two thermodynamic temperatures T and T0 where T0 = 273,15 K. An interval or difference of temperature may be expressed either in kelvins or in degrees Celsius. The unit “degree Celsius” is equal to the unit “kelvin”.’ GIVEN under my Official Seal, 01 May,
  7. HEATHER HUMPHREYS, Minister for Business, Enterprise and Innovation. EXPLANATORY NOTE (This note is not part of the Instrument and does not purport to be a legal interpretation.) These Regulations are made to give effect to Council Directive No. 2019/1258/EU of the European Parliament and of the Council of 23 July 2019 on the approximation of the laws of Member States relating to units of measurement. The main changes in the Regulations provide for new definitions of the SI base units. The new definitions are based on the new principle of fixed numerical values of the defining constants and are expected to improve the long-term stability and reliability of the SI base units as well as the accuracy and clarity of measurements. 1 Council Directive 80/181/EEC of 20 December 1979 on the approximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC (OJ L 39, 15.2.1980, p. 40) 2 OJ L 196, 24.7.2019, p. 6–9 Privacy Statement Accessibility European Legislation Identifier (PDF) Open Data License Ráiteas Príobháideachais Inrochtaineacht Aitheantóir Eorpach Reachtaíochta (ELI) Ceadúnas Sonraí Oscailte Liosta Fianán © Government of Ireland. Oireachtas Copyright Material is reproduced with the permission of the Houses of the Oireachtas © Rialtas na hÉireann. Atáirgtear ábhar faoi Chóipcheart le cead ó Thithe an Oireachtais

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