Theoretical study of third virial coefficient with Kihara potential

In this paper, a new formula has been presented for accurate calculation of the third virial coefficient with Kihara potential. The obtained formula allows us to the determination of thermodynamic properties of imperfect gases. The validity of the formula has been tested by application to some gases C2H6, C3H8, C(CH3)(4), and n - C5H12. The obtained results have been compared with the other studies. These comparisons show that the formula developed in this study is in good agreement with the data available in the literature.