A 983have L=n\, where n is the mean number of collisions an atom makes before escape, and A is the mean distance between collisions. It can be shown thatEquating these two expressions for L then yieldsApplication of this formula to a few simple geometries gives: Sphere of radius R:X -4R/3.Cylinder of radius R and length L: X = 2R/(1+R/2L).Cube of side L: \ = 2L/3.
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