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Meaning of Loschmidt's number

Lo'schmidt's num"ber

Pronunciation: (lō'shmits), [key]
— Chem. Chem.
  1. the number of molecules in one cubic centimeter of an ideal gas at standard temperature and pressure, equal to 2.687 × 10 Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.