Avogadro's law states that, at equal temperatures and pressures, equal volumes of an ideal gas contain the same number of molecules.

This law was put forth in 1811. Something that I learned in my thermodynamics class this year (Node your homework!) is that actual measurements, or even estimates, of Avogadro's number were not made until the early 1900's (first by Jean-Baptiste Perrin in 1908).

This law was used in constructing the ideal gas law.

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