Avogadro constant
SI defining constant |
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Name | Symbol | Value | Unit | Expressed in terms of SI base units | |
Avogadro constant | N_{A} | 6.022 140 76 × 10^{23} | mol^{−1} | mol^{−1} | |
DefinitionThe numerical value of the Avogadro constant, symbol N_{A}, is defined to be exactly 6.022 140 76 × 10^{23} when expressed in the unit reciprocal mole, symbol mol^{−1}. |
The Avogadro constant, N_{A}, forms the basis for the definition of the mole.
Nature
The Avogadro constant N_{A} is a proportionality constant between the quantity amount of substance (with unit mole) and the quantity for counting entities (with unit one, symbol 1). Thus it has the character of a constant of proportionality similar to the Boltzmann constant k.