Abstract
Using the high-pressure (0 to 1000 bars) sound-velocity measurements of Wilson (1960), an equation of state for PVT properties of water and seawater has been developed based on a modified Tait equation of the form V°−VPV°P=1B+A1P+A2P2, in which V° is the specific volume at atmospheric pressure, VP the specific volume at pressure P, and B, A1, and A2 are functions of temperature and salinity. The equation has been fit with a maximum deviation in compressibility of 0.01×10−6 bar−1 for seawater and 0.02×10−6 bar−1 for pure water. The data from this equation will yield specific volumes that show the excellent consistency of Ekman's (1908) measurements with the sound data. The results for pure water show a definite shift in Kell and Whalley's (1965) measurements and the superiority of the PVT data generated from the sound data to direct experimental measurements.
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