What did Avagadro do?

Question

Why is he notedin science

Answer 1

Avogadro came up with a very big number; 602,300,000,000,000,000,000,000 (6.023*10^23); that relates the total number of particles (atoms or molecules) in one mole of a gas. A mole of a gas is Avogadro's Number times the molecular weight of the gas. For instance, the molecular weight of a mole of oxygen is 32 grams (2 atoms of oxygen at 16 grams per atom). In this amount of oxygen there are 6.023*10^23 molecules of oxygen gas.

Answer 2

Is credited (1811) with being the first to realize that the volume of a gas (strictly, of an ideal gas) is proportional to the number of atoms or molecules.