“…Another source of these correlations were those calculated from zero-density speeds of sound and reported by Estrada-Alexanders and Trusler [22] for ethane, Trusler and Zarari [23] for propane, Ewing and Goodwin [24] for isobutane, Ewing et al [25] for nbutane and Ewing et al [26] for n-pentane. Finally, correlations were fitted in this study to perfect-gas isobaric-heat-capacity data by Pitzer and Kilpatrick [27] for n-hexane, Stephan and Hildwein [28] for n-heptane, Hossenlopp and Scott [29] for n-octane, Dorofeeva et al [30] for cyclohexane, Todd et al [31] for benzene and Chao et al [32] for toluene. For argon, c pg V,m /R = 1.5.…”