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Avogadro’s law, , ee aeadro’s law (Avogadro’s hypothesis or Avogadro’s principle) is a gas law named after Amedeo Avogadro, , in 1811. This law states that “equal volumes of all gases under the same conditions of temperature and, , pressure contain equal number of molecules”. If a gas contains n, molecules in volume V and gas B, , contains n, molecules in volume V at the same temperature and pressure, then according to the law n, =n,., Avogadro’s law can also be stated as “the volume of a gas is directly proportional to its number of moles, as long as the temperature and pressure are kept constant”., , Van Where ‘n’ is the number of moles., V= k,n ®, , where ‘k,’ is a constant.