HIGH-PRESSURE SPECIFIC-HEAT CAPACITIES OF PURE WATER AND SEAWATER

Equations of state for pure water and seawater were used to calculate high-pressure specific heat capacities at constant pressure (C//p) and at constant volume (C//v). Equations are given for pure water C//p and C//v values over the temperature range of 0-100 degree C and pressure range of 0-1000 bar. Equations are also given for seawater C//p and C//v values over the salinity range of 0-40, temperature range of 0-40 degree C, and pressure range of 0-1000 bar. These equations agree with the direct measurements reported in the literature for pure water to within plus or minus 0. 026% over the measurement ranges of 20-100 degree C up to 500 bar. No direct-pressure seawater measurements are available for comparison.