Avogadro's law: Meaning and Definition of

A'voga'dro's law'

Pronunciation: [key]
— Chem. Chem.
  1. the principle that equal volumes of all gases at the same temperature and pressure contain the same number of molecules. Thus, the molar volume of all ideal gases at 0° C and a pressure of 1 atm. is 22.4 liters.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.