ENTROPY OF 2-DIMENSIONAL LENNARD-JONES FLUIDS

The entropy of two-dimensional Lennard-Jones fluids is calculated from computer simulation results for the radial distribution function. The applicability of the first-order Weeks-Chandler-Andersen perturbation theory to this calculation and dependence of the entropy on the pertu rbation parameter are analyzed, and a simple analytical expression is proposed for the entropy. Finally, the physical connection between ent ropy and molecular order is made through the values of the radial dist ribution function and of the average number. of interparticle interact ions.