August 9
th is the birthday of an important figure in chemistry, Amedeo Avogadro. Avogadro was the Italian chemist who formulated the ideal gas law that equal volumes of gas at the same pressure and temperature contain the same number of particles. Avogadro's number, 6.022x10
23, is the number of particles per mole of a substance. It is the number of atoms in exactly 12 grams of carbon-12.
You can read more about Avogadro or find out what else occurred on this day in science history.
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