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Concepts in Thermal Physics$
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Stephen J. Blundell and Katherine M. Blundell

Print publication date: 2009

Print ISBN-13: 9780199562091

Published to Oxford Scholarship Online: February 2010

DOI: 10.1093/acprof:oso/9780199562091.001.0001

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Molecular effusion

Molecular effusion

Chapter:
(p.64) 7 Molecular effusion
Source:
Concepts in Thermal Physics
Author(s):

Stephen J. Blundell (Contributor Webpage)

Katherine M. Blundell (Contributor Webpage)

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199562091.003.0007

This chapter discusses the effusion of gases through small holes and the concept of flux. Effusion is the process by which a gas escapes from a very small hole. The empirical relation known as Graham's law of effusion states that the rate of effusion is inversely proportional to the square root of the mass of the effusing molecule. The concept of flux is a very important one in thermal physics. It quantifies the flow of particles or the flow of energy or even the flow of momentum.

Keywords:   effusion, flux, Graham's law, gas

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