Calculation of Kirkwood–Buff integrals for one-component fluids using the Barker–Henderson perturbation theory

It will be shown that the unification of the thermodynamics from the compressibility equation with that of the Barker–Henderson perturbation theory enables us to find an explicit formula to accurately calculate the Kirkwood–Buff integrals for one-component fluids. The results of calculations show good agreement with those of the Percus–Yevick equation.