| Mean Free Path |
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| statistical mechanics | |
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The formula for calculating the magnitude of the mean free path depends on the characteristics of the system the particle is in. For a particle with a high velocity relative to the velocities of an ensemble of identical particles with random locations, the following relationship applies: : Where is the mean free path, ''n'' is the number of particles per unit volume, and σ is the effective Cross-section al area for collision. If, on the other hand, the velocities of the identical particles have a Maxwell Distribution of velocities, the following relationship applies: : EXTERNAL LINKS
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