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Define mean free path....

Define mean free path.

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Mean free path: The average distance by can travel an atom or a molecule without colliding is called "mean free path".
`l = 1/(sqrt(2)pi nd^(2))`
Where n is the numer of molecules per unit volume and d is the diameter of the molecule.
(or)
Mean free path of gas molecules is the average distance covered by a molecule between two successive collisions.
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