Reduced third virial coefficients of several gases made of spherical molecules interacting with the HFD - C potential has been calculated as a function of the reduced temperature. A correlation equation C*(T*) For spherical gases is presented. Theoretical results have been compared with the experimental data for Ar, Kr, Xe, CH4, CF4, and SF6. Furthermore, the values of the compressibility factors have been obtained in the reduced temperature range 1.5 ? T* ? 10 and reduced pressure range 0.02 ? P*?1.00. Satisfactory agreement is found between the theoretical and experimental results over the entire temperature and pressure range studied.
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