The proposition 39 equal volumes of different gases contain equal numbers of molecules at the same t...........

General Science (NDA) Chemistry

The proposition 'equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure' is known as-

Avogadro's hypothesis

Gay-Lussac's hypothesis

Planck's hypothesis

Kirchhoff's theory

Explanation:

Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." i.e, for a given mass of an ideal gas, the volume VV is directly proportional to the amount (moles) of the gas nn if the temperature and pressure are constant.