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mean sun
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mean free path
mean free path (plural mean free paths)


noun 
Definition:
 
average distance traveled by gas molecule: the average distance that a gas molecule travels before it collides with another molecule or with the containing vessel.
Symbol  λ
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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