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We present a series of optimal (in the sense of least-squares) curve fits forthe stiffened gas equation of state for single-phase liquid water. At highpressures and (subcritical) temperatures, the parameters produced by thesecurve fits are found to have very small relative errors: less than $1\%$ in thepressure model, and less than $2\%$ in the temperature model. At low pressuresand temperatures, especially near the liquid-vapor transition line, the errorin the curve fits increases rapidly. The smallest pressure value for whichcurve fits are reported in the present work is 25 MPa, high enough to ensurethat the fluid remains a single-phase liquid up to the maximum subcriticaltemperature of approximately 647K.

Accurate curve fits of IAPWS data for high-pressure, high-temperature single-phase liquid water based on the stiffened gas equation of state