Variable Cp Relationships for Ideal Gases

This Excel file tabulates fourth-order polynomial coefficients for Cp as a function of temperature for a wide selection of ideal gases. How is variable Cp used? Recall for an ideal gas: h2-h1 = Integral (Cp dT). When Cp is variable, you must integrate Cp(T)dT in order to determine the enthalpy change.

The following ideal gases have their Cp variable coefficients tabulated in this file: CO, CO2, H2, O2, N2, Air, SO2 (sulfur dioxide), CH4 (methane), C2H2 (acetylene), Ne.