Amedeo Avogadro was a professor of

physics in the University of Turin, but is best known for his contributions to

chemistry. He followed the work of Gay Lussac closely and realised early on the

difference between atoms and molecules. Avogadro suggested that equal volumes of gases under the same conditions of tem

perature and pressure contained equal

numbers of particles. The number of

particles in a mole, 6,022x1023  , is called Avogadro´s Number in his honour.

1776 - 1856

Amedeo