Weeks-Chandler-Andersen , density

Although a large nrunber of theoretical approaches can be used to describe 2D Letmard-Jones systems, the Reddy-O Shea and the Cuadros-Mulero expressions for the equation of state are the most usefril from a practical point of view. In particular, the Cuadros-Mulero equation is the simplest expression and can be easily applied over a wide range of temperatures and densities. Moreover, it is based on the Weeks-Chandler-Andersen perturbation theory, thus permitting the study of the effects of the intermolecular repulsive and atlractive forces. 

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