IEVref: 113-02-08 ID: Language: en Status: Standard Term: Avogadro constant Synonym1: Avogadro number [Deprecated] Synonym2: Synonym3: Symbol: NA Definition: conventional physical constant which relates the amount of substance to the number of entities in a given sample, the value of which is set to 6,022 140 76 × 1023 mol−1 Note 1 to entry: The definition of the Avogadro constant in IEV 113-02-08:2014-05 was: "fundamental physical constant equal to the number N of elementary entities in a given sample of matter, divided by the amount of substance n of that sample, NA=N/n", incorrectly describing the Avogadro constant as a "fundamental physical constant". Note 2 to entry: The Avogadro constant is used in the SI to define the mole. Note 3 to entry: The term “Avogadro number” is deprecated since a number is a quantity with unit one, and it is used for a different concept (see IEV 113-02-18). Publication date: 2020-12 Source: SI Brochure, 9th edition, 2019, 2.2, modified – The definition in the SI Brochure has been revised to comply with the IEV rules. Replaces: 113-02-08:2014-05 Internal notes: CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: