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A capital N with subscript A, the number of entities in a mole.
Also known as: Avogadro's number, N with a subscript A
N_A is the number of entities in one mole, exact since 2019. It is a counting factor rather than a measured property of nature — which is why it could be fixed by definition at all.
Denotes the number of elementary entities in one mole of substance.
Contexts: Mathematics, Laboratory
Has had an exact value, 6.022 140 76 × 10²³ per mole, since 2019, when the mole was redefined as a fixed count rather than as a mass of carbon-12.
Contexts: Mathematics, Laboratory
Is a counting factor rather than a measured property of nature, which is why it could be fixed by definition where the gravitational constant cannot.
Contexts: Mathematics, Laboratory
A capital Latin letter N in italic type followed by a small capital A set as a subscript below the baseline.
The mole is defined as this number of entities.