define graham's law
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a law stating that the rates of diffusion and effusion of a gas are inversely proportional to the square root of the density of the gas.
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Graham's law of effusion was formulated by Scottish physical chemist Thomas Graham in 1848. Graham found experimentally that the rate of effusion of a gas is inversely proportional to the square root of the mass of its particles. This formula can be written as: , where: Rate₁ is the rate of effusion for the first gas.
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