average distance that particles of a given type travel between specific interactions in a given medium
Note 1 to entry: The mean free path may be specified for all interactions, i.e., total mean free path, or for particular types of interaction such as scattering, capture, or ionization. Note 2 to entry: The mean free path is the reciprocal of the macroscopic cross-section. Note 3 to entry: This entry was numbered 393-14-86 in IEC 60050-393:2003.
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