Determination of interaction second virial coefficients; He‐CO2 system

Abstract
We have obtained values for interaction second viral coefficients of the helium‐carbon dioxide system in the range 230 ⩽ T/K ⩽ 300. Our experimental technique is essentially the Burnett mixing method described by Hall and Eubank (1973, 1974). We have modified the analysis to account for higher‐order effects and to detect significant systematic errors. We also report virial coefficients for the pure components: helium in the range 100 ⩽ T/K ⩽ 300 and carbon dioxide at 300 K.