In this work, we have used a simple equation of state (EoS) to predict some thermodynamic properties of air as a pseudo pure fluid and as a ternary mixture of nitrogen, oxygen and argon and as a binary mixture of nitrogen and oxygen at different temperatures and pressures. A comparison with literature tabulated values has been made. The agreement of calculated densities with corresponding tabulated values is good for which the average absolute deviations are better than 0.06 %, if we assume air as a pseudo pure fluid, and 0.9 % and 1.2 % if we consider air as a ternary mixture and as a binary mixture, respectively. To show the ability of this equation of state to predict density, the calculated densities of air have been compared with those computed from other methods.

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