In this publication, a qualitative study is conducted to investigate how different equations of state perform for different gases at different temperatures and pressures. Perfect Gas, Redlich-Kwong, Aungier/Redlich-Kwong, Soave/Redlich-Kwong, Peng-Robinson, and Cool Prop are used to calculate the properties of H2, N2, Ο2, CH4, CO2, and air at a reduced temperature between 1.89 and 6.04 and reduced pressure between 0.027 and 6.661.
The similarity of the accuracy of each equation independently of the gas is estimated and general rules of their performance are indicated.
