“…For a scientist it is very important to choose the appropriate model for a given class of fluids or even for a particular fluid at a particular temperature (Kolasinska and Vera, 1986;Joback andReid, 1987, Ibrahim andMurad, 1989;Hurst and Harrison, 1992;Mulero et al, 2006aMulero et al, , 2006bMulero et al, , 2006cMulero et al, , 2006dMulero et al, , 2006e, 2010aMulero and Parra, 2008;Cachadiñ a and Mulero, 2009;Miqueu et al, 2000). The most extensively used correlations are based on the corresponding states principle (Poling, 2001;Xiang, 2005).…”