where B (m3 mol"1) is the second Virial coefficient.

One advantage of two-term Virial equation of state is that it is simple and accurate to some extent. After Eq. (43) is incorporated into Eqs. (41) and (42) and integrated, we will obtain:

B Ps


For pure-component non-polar molecules, the second Virial coefficient is commonly determined by the Tsonopoulos equation:

Kl where fm =0.1115 °-33° °"1385 °-°121 0-°00607 (48)

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