Volumetric behavior of the binary systems benzene-cyclohexane and benzene-2,2,4-trimethyl-pentane at temperatures 293.15-323.15Â K

► VmE of the title systems was calculated via densities from the vibrating tube method. ► VmE of benzene + cyclohexane agrees well with old data from pycnometric measurement. ► Experimental results were correlated by Redlich-Kister and Peng-Robinson expressions. ► The harmonic rule (instead of geometric) was used to get Peng-Robinson constant a12.