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Definition of Avogadro's law
1. Noun. The principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules.
Medical Definition of Avogadro's law
1. Equal volumes of gases contain equal numbers of molecules, the conditions of pressure and temperature being the same. Synonym: Ampere's postulate, Avogadro's hypothesis, Avogadro's postulate. (05 Mar 2000)