Second Virial Coefficients of Argon, Krypton, and Argon-Krypton Mixtures at Low Temperatures
Abstract
Second virial coefficients of argon between 80-125°K, and krypton (105-140°K), have been measured. The experimental values are 5-15% larger in magnitude than those calculated from 12-6 or exp—6 potential functions by the substitution of parameters assigned to describe high-temperature virial coefficients. Second virial coefficients calculated from the potential-distance relationship proposed by Guggenheim and McGlashan are within 1% of the experimental values for argon, but are about 4% smaller in magnitude than the measured krypton coefficients.
Argon-krypton mixed virial coefficients have been determined between 105-125°K. These experimental results are best expressed by a 12-6 potential energy parameter combining rule ɛ12=2ɛ1ɛ2/ɛ1+ɛ2.- Publication:
-
Journal of Chemical Physics
- Pub Date:
- April 1962
- DOI:
- 10.1063/1.1701284
- Bibcode:
- 1962JChPh..36.1881F