Equal volumes of ideal gases at the same temperature and pressure contain equal amounts of substance. Named after Amedeo Avogadro. From , is common to them.
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Avogadro's law states that, at constant temperature and pressure, equal volumes of gases contain an equal number of molecules, regardless of the type of gas. This means that the volume of a gas is directly proportional to the number of moles (or molecules) of the gas when temperature and pressure are kept constant.