The critical compressibility factor value: associative fluids and liquid   alkali metals
  We show how to obtain the critical compressibility factor $Z_c$ for simple and associative Lennard-Jones fluids using the critical characteristics of the Ising model on different lattices. The explanation for the results on the critical point line of the Lennard-Jones fluids and liquid metals is proposed within the global isomorphism approach. 
Vladimir Kulinskii
cond-mat.stat-mech