Pressure dependence of the dielectric constant of H2O and D2O

The static dielectric constant of H2O and D2O have been measured at 10, 25, and 40°C at pressures up to 3 kbar by a bridge method. An all-glass, three-terminal, Kay-Vidulich-type dielectric cell was designed specifically for these high pressure measurements and was used in conjunction with a bridge that was equipped with a capacitance-inductance free, conductance balancing network. The structurally significant quantities gKμ2 and gK, the Kirkwood correlation factor, were evaluated from the experimental data and the Fröhlich equation. Their pressure dependence and the structural implications are analyzed in detail.