Amedeo Avogadro

Amedeo Avogadro's hypothesis that equal volumes of gases at the same temperature and pressure contain the same number of molecules was a revolutionary insight that clarified the distinction between atoms and molecules. This concept, now known as Avogadro's Law, is essential for understanding stoichiometry and gas behavior. His work provided the necessary bridge between Dalton's atomic theory and the practical measurement of chemical reactions. Today, Avogadro's constant is a fundamental physical constant used in every aspect of quantitative chemistry.