# Graham’s Law of Diffusion

**Graham’s Law of Diffusion (1829):**

This law states that, “At constant temperature and pressure, the rate of diffusion of various gases is inversely proportional to the square root of their density”.

I.e.

where r = rate of diffusion and d =density

= =

where M stands for molar mass of the gas. When two gases are compared at different pressures then we may write,

where P is the pressure of the gas. Therefore,

= =

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