Avogadro's Law

Equal volumes of an ideal gas contain equal numbers of molecules, if both volumes are at the same temperature and pressure. For example, 1 L of ideal gas contains twice as many molecules as 0.5 L of ideal gas at the same temperature and pressure.

It is, in fact, only true for ideal gases.

See also: Avogadro, Armedeo, Dalton′s Law of Partial Pressures.

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Subjects: Physics