Compressibility of distilled water and seawater

Abstract The compressions of distilled water and of seawater of approximately 31, 35, and 39% salinity were measured at 10°C for pressures up to 1000 bars. The data were summarized by a ‘best’ least-square fit polynomial in pressure and salinity. The summary formula was combined with Bryden's ( Deep-Sea Research , 20 , 401–408, 1973) similar type fit to our earlier thermal expansion data ( Bradshaw and Schleicher , Deep-Sea Research , 17 , 691–706, 1970) and Fofonoff and Bryden's ( Journal of Marine Research , in press) recent empirical formula for sigma-0 of seawater to give an expression for the specific volume of seawater as a function of temperature, pressure and salinity in the salinity range 31 to 39%. At 35% specific volumes from this expression in the oceanographic range of temperature and pressure agree within 15 × 10 −6 cm 3 g −1 with those computed using sound velocities ( Wang and Millero , Journal of Geophysical and Research , 78 , 7122–7128, 1973). Our mean compressibilities for distilled water at 10°C also agree with those from sound velocities (to within 0·05%) but disagree with those of Kell and Whalley ( Philosophical Transactions of the Royal Society of London , A, 258 , 565–614, 1965) by about 0·3%.

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