A purely statistical mechanical approach is proposed to account for the liquid–vapor critical
point based on the mean density approximation (MDA) of the direct correlation function. The
application to hard-core Yukawa (HCY) fluids facilitates the use of the series mean spherical
approximation (SMSA). The location of the critical parameters for HCY fluid with variable
intermolecular range is accurately calculated. Good agreement is observed with computer
simulation results and with the inverse temperature expansion (ITE) predictions. The ...