It states that “Equal volumes of ideal gases contain equal number of moles at constant P and T conditions”. It also means that volume of a gas is directly proportional to its number of moles at constant pressure and temperature.

V   α n

V/n = constant (V/n = Vm i.e. molar volume)

For example, the volume occupied by 1 mole of an ideal gas at S.T.P. is 22.4 L.

Avogadro’s law: At constant T and P, the volume of an ideal gas increases proportionately as its molar amount increases. If the molar amount is doubled, the volume is doubled. If the molar amount is hailed the volume is halved.

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