Second virial coefficients at 300-500 K for butane, tetramethylsilane and 'Freon 114'

Abstract

A constant-volume gas-thermometer technique has been used at sub- atmospheric pressure to provide second virial coefficients to above 500 K from initial values in the vicinity of 300 K. The results for three organic vapours, butane, tetramethylsilane, 1,2-dichloro-1,1,2,2- tetrafluoroethane, are provided and expressed in terms of the intermolecular parameters for the Lennard-Jones (12-6) potential and the De Rocco and Hoover spherical-shell potential.