“…Scholars in the University of Leeds and the Air Products (Ashton & Haselden, 1980) adopted a flow calorimeter to obtain the enthalpy-temperature relationships of natural gas over the range of temperatures from 373 K to 200 K. To improve the predictions of a computer program based on a modified Redlich-Kwong equation of state, the enthalpy-temperature relationships of binary mixtures of methane and ethane, propane, and nitrogen were determined in Shell Laboratorium (Van Kasteren & Zeldenrust, 1979). The above data are the basis for the accuracy analysis of the equations of state in enthalpy prediction, where the components of the mixtures are shown in Table 7.…”