Analytic equation of state for exponential-six fluid based on the Ross variational perturbation theory and the Percus-Yevick radial distribution function of hard spheres

Comparison of the results of compressibility factor (PV/NkT) and reduced internal energy (U/NkT) for the exp-6 fluids at three reduced temperatures, kT/ε0 = 5, 20 and 100. Lines, calculated in present work. Symbols, Monte Carlo simulations by Fried and Howard [L.E. Fried, W.M. Howard, J. Chem. Phys. 109 (1998) 7338]: +, α = 11.5; □, α = 13.5; ∘, α = 15.5.