Amedeo Avogadro
Lorenzo Romano Amedeo Carlo Avogadro, Count of Quaregna and Cerreto (,
also , ; 9 August 17769 July 1856) was an
Italian scientist, most noted for his contribution to
molecular theory now known as
Avogadro's law, which states that equal volumes of gases under the same conditions of temperature and pressure will contain equal numbers of molecules. In tribute to him, the ratio of the number of elementary entities (
atoms,
molecules,
ions or other particles) in a substance to its
amount of substance (the latter having the unit
mole), , is known as the
Avogadro constant. This constant is denoted ''N''
A, and is one of the seven defining constants of the
SI.
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