| 21. | Many other mean free paths can be defined.
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| 22. | This leads to a mean free path
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| 23. | The mean free path " ? " is the average distance traveled by electrons before their collisions.
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| 24. | Thus, if the electrical conductivity is low, the mean free path of the electrons is very short.
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| 25. | Copper nanowires less than 40 nm wide will shorten the mean free path to the wire width.
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| 26. | Sometimes one measures the thickness of a material in the " number of mean free paths ".
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| 27. | Because of spectrum hardening, the " mean free path " of the X-ray spectrum changes with distance.
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| 28. | In fact, the kinetic diameter of a molecule is defined in terms of the mean free path.
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| 29. | When " L " is larger than the phonon mean free path, Umklapp scattering process limits thermal conductivity.
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| 30. | At Lower Rainham the route heads into Riverside Country Park and follows traffic-free paths beside the River Medway.
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