Symbol NA or L. The number of atoms or molecules in one mole of substance. It has the value 6.022 1367(36) × 1023. Formerly it was called Avogadro’s number.
Chemistry
The number of atoms or molecules in one mole of substance. It has the value 6.022 140 857(74) × 1023. Formerly it was called Avogadro’s number.
Geology and Earth Sciences
The number of molecules, atoms, or ions in one mole of a substance: 6.02252 × 1023 per mole. It is derived from the number of atoms of the pure isotope 12C in 12 grams of that substance and is the reciprocal of atomic mass in grams.