Avogadro's law Meaning, Definition & Usage
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noun the principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules
Avogadro's hypothesis.
WordNet
Definitions
(Chem.) , a fundamental conception, according to which, under similar conditions of temperature and pressure, all gases and vapors contain in the same volume the same number of ultimate molecules; so named after Avogadro, an Italian scientist. Sometimes called Ampère's law.