An Etymological Dictionary of Astronomy and Astrophysics

The → SI unit of amount of → substance; symbol mol. One mole contains exactly 6.022 140 76 × 10²³ elementary entities. This number is the fixed numerical value of the → Avogadro constant, N_A, when expressed in the unit mol^-1.

See also: From Ger. Mole, short for Molekül, from Fr. → molecule.