Avogadro's number

  1. the constant, 6.022 × 1023, representing the number of atoms, molecules, or ions in one mole of a substance. Symbol: N: Compare gram-atom, gram molecule.

Origin of Avogadro's number

First recorded in 1925–30; see origin at Avogadro's law
  • Also called Avogadro constant.

Words Nearby Avogadro's number

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

Scientific definitions for Avogadro's number

Avogadro's number

  1. The number of atoms or molecules in a mole of a substance, approximately 6.0225 X 1023. It is based on the number of carbon atoms in 12 grams of carbon 12.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.