Breadcrumb Home > Dictionary > Index A Avogadro's law: Meaning and Definition of Find definitions for: A'voga'dro's law' Pronunciation: [key] — Chem. Chem. 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. Avogadro Avogadro's number TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census 50 Spookiest Halloween Quotes Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: factotum Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language