mean free path


: the average distance traversed between collisions by particles (such as molecules of a gas or free electrons in metal) in a system of agitated particles

Examples of mean free path in a Sentence

Recent Examples on the Web Water molecules are floating all around in the air, and their mean free path is around 100 nm. Andrew Paul, Popular Science, 24 May 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'mean free path.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1879, in the meaning defined above

Time Traveler
The first known use of mean free path was in 1879

Dictionary Entries Near mean free path

Cite this Entry

“Mean free path.” Dictionary, Merriam-Webster, Accessed 23 May. 2024.

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