Thermodynamic Properties of Fluids from Speed of Sound: Integration Along Isentropes

The equations connecting speed of sound with other thermodynamic properties gases and liquids, suitable for numerical integration respect to temperature, density, pressure, along isentropes, are derived. Algorithms their solution given too. They tested several substances (e.g., Ar, N2, O2, CH4, CO2, H2O) in wide ranges pressure temperature. Average absolute deviation thermal is 0.0129% supercritical gaseous phase, 0.0308% transcritical 0.0009% liquid phase. Corresponding deviations caloric 0.1706%, 0.1863%, 0.0702%, respectively.