Amedeo Avogadro

Lorenzo Romano Amedeo Carlo Avogadro, Count of Quaregna and Cerreto, was born in Italy on 9 August 1776. He turned his attention to molecular theory and arrived at the insight now called Avogadro's law: that equal volumes of gases under identical temperature and pressure contain equal numbers of molecules. The principle clarified relationships that had confounded earlier chemists. Long after his death on 9 July 1856, the scientific community formalized the tribute: the ratio of elementary entities in a substance to its amount—the Avogadro constant, NA—was fixed at 6.02214076×10²³ mol⁻¹ and des…