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IEVref: | 112-02-09 | ID: | |

Language: | en | Status: Standard | |

Term: | mole | ||

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Symbol: | mol | ||

Definition: | SI unit of amount of substance, equal to the amount of substance of a system that contains 6,022 140 76 × 10^{23} specified elementary entities
Note 1 to entry: The definition in the SI Brochure is: "The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6,022 140 76 × 10 The amount of substance, symbol Note 2 to entry: The definition of the mole in IEV 112-02-09:2010-01 fixed the value of the molar mass of carbon 12, Note 3 to entry: The mole is one of the seven SI base units: second (s), metre (m), kilogram (kg), ampere (A), kelvin (K), mole (mol) and candela (cd). | ||

Publication date: | 2020-12 | ||

Source: | SI Brochure, 9th edition, 2019, 2.3.1, modified – The definition in the SI Brochure has been revised to comply with the IEV rules. Notes 1 to 3 to entry have been added. | ||

Replaces: | 112-02-09:2010-01 | ||

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Note 1 to entry: The definition in the SI Brochure is: "The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6,022 140 76 × 10^{23} 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."

Note 2 to entry: The definition of the mole in IEV 112-02-09:2010-01 fixed the value of the molar mass of carbon 12, *M*(^{12}C), as exactly equal to 0,012 kg/mol. According to the current definition of the mole, *M*(^{12}C) is no longer known precisely and has to be determined experimentally.

Note 3 to entry: The mole is one of the seven SI base units: second (s), metre (m), kilogram (kg), ampere (A), kelvin (K), mole (mol) and candela (cd).