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- Graham’s Law of Diffusion
In 1833, Thomas Graham, an English chemist, performed an experiment and discovered that a lighter gas diffuses through a medium much faster than a heavier gas. He carried out further experiments to investigate the relationship between the rate of diffusion of a gas and its densityDensity is the measurement of how tightly a material is packed together i.e. how closely the particles are packed in the material. The tighter the material is packed the more its... More.
His findings led to Graham’s law of Diffusion which states that at constant temperature and pressure, the rate of diffusion of a gas is inversely proportional to the square root of its density or relative molecular mass.
Rate of diffusion \( \scriptsize \propto \normalsize \frac{1}{\sqrt{d}} \) (P,T constant)
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