Avogadro

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A·vo·gad·ro

(ah'vō-gahd'rō),

Avogadro

named after Amedeo Avogadro, an Italian physicist 1776-1856.

A's law
equal volumes of perfect gases at the same temperature and pressure contain the same number of molecules.
A's number, A's constant
the number of particles of the type specified by the chemical formula of a certain substance in 1 gram-molecule of the substance.