A'voga'dro's law'

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.

AvogadroAvogadro's number
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