1776 – Avogadro – bio

Amedeo Avogadro was born in 1776 in Turin, Italy and is mostly known for discovering a relationship between mass and volume of gases that is now known as “Avogadro’s Law”. This law states that equal volumes of two different gases, at equal temperature and pressure, contain an equal number of molecules. It follows that the relationship between the masses of the two gas samples corresponds to the relationship between their molecular weights. From this it was possible to deduce that some gas molecules contained two atoms of the gas. (diatomic) Eventually, it became possible to calculate the number of molecules in a given volume. This used to be known as “Avogadro’s Number” and was expressed as 2.73 x 10^26 molecules per pound, but is now more commonly known as “Avogadro’s Constant” and is expressed as 6.02 x 10^23 molecules per gram.

1627 – Boyle

1743 – Lavoisier
1754 – Proust
1766 – Dalton
1775 – Ampere

1807 – Laurent
1816 – Gerhardt
1834 – Mendeleev
1821 – Loschmidt
1844 – Boltzmann
1870 – Perrin

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