Dictionary  A'voga'dro's law'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.
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