Examples
A classic application of the mean free path is to estimate the size of atoms or molecules. Another important application is in estimating the resistivity of a material from the mean free path of its electrons.
For example, for sound waves in an enclosure, the mean free path is the average distance the wave travels between reflections off the enclosure's walls.
In aerodynamics, the mean free path is in the same order of magnitude as the shockwave thickness at mach numbers greater than one.
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