MEAN FREE PATH

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MEAN FREE PATH:Definition:The distance travelled by a gas molecule between two successive collisions is known as free path and the mean of free paths is called mean free path.Explanation:Consider the molecules of a gas are spheres of diameter 'd' moving with average speed 'V'.The molecules gets collide with one another that comes within a distance 'd' between their centers.In time 'Δt' it sweeps a volume πd2VΔt and collide with another molecule.If 'n' is the number of molecules per unit volume, then the molecule 'n πd2V Δt' number of collisions in the time Δt second.The time interval between any two successive collisions.

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