## Avogadro

Avo·ga·dro (

*Conte di Quaregna e Ceretto*) 1776-1856; It. chemist & physicist- Additional evidence as to the structure of the molecule was discussed by
**Avogadro**in 1811, and by Ampere in 1814. - Equal changes in temperature and pressure occasion equal changes in equal volumes of all gases and vapours -
**Avogadro**deduced the law: Under the same conditions of temperature and pressure, equal volumes of gases contain equal numbers of molecules; and he showed that the relative weights of the molecules are determined as the ratios of the weights of equal volumes, or densities. - The weight contained in a molecule of hydrochloric acid, thus differing from
**Avogadro**who chose the weight of a hydrogen molecule. - The development of the atomic theory and its concomitants - the laws of chemical combination and the notion of atoms and equivalents - at the hands of Dalton and Berzelius, the extension to the modern theory of the atom and molecule, and to atomic and molecular weights by
**Avogadro**, Ampere, Dumas, Laurent, Gerhardt, Cannizzaro and others, have been noted. - According to the law of
**Avogadro**, equal volumes of different gases under the same conditions of temperature and pressure contain equal numbers of molecules; therefore, since the density depends upon the number of molecules present in unit volume, it follows that for a comparison of the densities of gases, the determinations must be made under coincident conditions, or the observations reduced or re-computed for coincident conditions.

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