*Graham' law of diffusion :* At the given temperature and pressure the rate of diffusion of a gas is inversely proportional to square root of it' density (or) molar mass (or) vapour density.
Applications :
→ This principle is used to detect unknown molar mass of a gas.
→ This principle is used to separate isotopes.
Eg : Separation of 92U235, 92U238
→ This principle is used in Ansil alarms.
