Vapor Viscosities and the Sutherland Equation
- 1 February 1933
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 1 (2) , 170
- https://doi.org/10.1063/1.1749269
Abstract
Reversing the usual procedure of calculating molecular diameters from the kinetic-theory viscosity equation, it is suggested that the Sutherland constant be found, to serve as a criterion for the accuracy of this constant as obtained from viscosity-temperature data. The molecular diameter is taken proportional to the cube root of the molar volume of the liquid at the boiling point, as indicated by the theory of corresponding states; the error is small. Review of the available values of C indicates that many of them are erroneous, because of experimental error, magnified by extrapolation, or possible failure of the Sutherland equation. The Vogel rule, C = 1.47 Tb, is found valid to within 10 percent. The recent data of Braune and Linke, Melaven and Mack, and Lowry and Nasini are criticized.Keywords
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