The Song, Mason and Ihm [1–4] equation of state with modification of Tao and Mason [5], originally derived for spherical and molecular fluids, is applied for fluid uranium tetrafluoride and thorium tetrafluoride based on the available experimental data. The equation of state based on statistical mechanical perturbation theory with the perturbation scheme of Weeks, Chandler, and Andresen [6]. The prediction of constants applied in the equation of state is based on the work of Boushehri et al. [7–8] using heat of vaporization and liquid density at the triple point. The vapor correction term bases on the experimental data. The results show that this equation of state agrees reasonably well with the available experimental data.

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