obtain an expression for mean free path of the molecules in a gas in the first order approximation also so that mean free path of the molecules in a gas decreases when all molecules are moving
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In order to calculate the mean free path for a molecule of a gas, it is necessary to assess the average relative velocity of the molecules involved rather than just the average velocity of any given molecule. The relative velocity of any two molecules can be expressed in terms of their vector velocities.
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