mole (mol)

Document v1 · published by Koskamo · updated 2026-10-05

The mole (symbol mol) is the SI base unit of amount of substance, per the BIPM SI Reference Point.

Name: mole
Symbol: mol
Unit type: SI base unit
Quantity kind: amount of substance
Definition (status current, in force since 2019-05-20): The mole, symbol $\rm{mol}$, is the SI unit of amount of substance. One mole contains exactly $6.022\:140\:76 \times 10^{23}$ elementary entities. This number is the fixed numerical value of the Avogadro constant, ${N_{\rm{A}}}$, when expressed in the unit ${\rm{mol}}^{-1}$ 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.
Defining constant: Avogadro constant (fixed numerical value 6.022 140 76 x 10²³)
Defining equation: 1\;{\rm{mol}} = \left(\frac{6.022\:140\:76 \times 10^{23}}{{N_{\rm{A}}}}\right)
Defining resolution: https://si-digital-framework.org/bodies/CGPM#CGPM26-Res1
Superseded definitions: mole1971 (1971-10-04 to 2019-05-19)

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Original source: si-digital-framework.org
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: BIPM SI Reference Point (si-digital-framework.org), the SI defining constants, base and derived units, and prefixes; CC BY 3.0 IGO

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The mole (symbol mol) is the SI base unit of amount of substance, per the BIPM SI Reference Point.

- Name: mole
- Symbol: mol
- Unit type: SI base unit
- Quantity kind: amount of substance
- Definition (status current, in force since 2019-05-20): The mole, symbol $\rm{mol}$, is the SI unit of amount of substance. One mole contains exactly $6.022\:140\:76 \times 10^{23}$ elementary entities. This number is the fixed numerical value of the Avogadro constant, ${N_{\rm{A}}}$, when expressed in the unit ${\rm{mol}}^{-1}$ 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.
- Defining constant: Avogadro constant (fixed numerical value 6.022 140 76 x 10²³)
- Defining equation: 1\;{\rm{mol}} = \left(\frac{6.022\:140\:76 \times 10^{23}}{{N_{\rm{A}}}}\right)
- Defining resolution: https://si-digital-framework.org/bodies/CGPM#CGPM26-Res1
- Superseded definitions: mole1971 (1971-10-04 to 2019-05-19)

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Published by Koskamo2026-10-05
Version 1