Details for The Mean Free path of Air

Name:The Mean Free path of Air
Description:Jennings, S.G. (1988). - The mean free path in air. J. Aerosol Sci., 19, 159 - 166.


Values for the mean free path l in air are presented for temperatures 15, 20, 23 and 25°C for both dry air and moist air at relative humidities of 50 and 100%, at atmospheric pressure (1.01325 × 105 Pa) and at pressure 1 × 105 Pa. Use is made of an expression which minimizes the dependence on physical ‘constants’ for mean free path: image where μ is the viscosity of air, p is the density of air, P is the pressure and μ is a numerical factor equal to 0.4987445. Differences of up to 1.6% were obtained between the values of mean free path at 23°C from this work and that of other workers. Comparison between the Cunningham slip correction factor from the present work and that from other work shows differences up to 1.8%.
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Created On: 07/31/1988 11:24
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