Graham's law

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Graham's law

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Summary

Graham's law states that the rate of effusion (the escape of a gas from a container) is inversely proportional to the square root of the molecular weight of the gas. This is because as molecular weight increases, there are more molecules per unit volume, which leads to increased resistance to flow. In other words, it takes more force to push a heavier molecule through a given space than it does for a lighter molecule.