Avogadro's law

Avogadro

\ˌav-ə-ˈgäd-(ˌ)rō, ˌäv-\play ,

Count Amedea

(1776–1856), Italian physicist and chemist. Avogadro is considered one of the founders of physical chemistry. In 1811, he made his outstanding scientific contribution: his hypothesis, now accepted as a scientific law, that equal volumes of gases at the same temperature and pressure contain the same number of molecules. This hypothesis was a landmark in 19th-century chemistry and is one of the basic concepts of modern chemistry.