The Static Dielectric Constant of Water at High Pressures and Temperatures to 500 MPa and 550°C

Abstract

Abstract Measurements of the static dielectric constant (permittivity) of water have been made between 100 and 550°C to a maximum pressure of 500 MPa. A capacitor within a high‐pressure vessel and a transformer ratio bridge at a frequency of 100 kHz were used. The capacitor was made of two coaxial half‐cylinders, which could be rotated against each other to eliminate lead capacities. At 200°C and 100 and 500 MPa resp. values of 38.0 and 45.8 and at 500°C and at the same pressures values of 9.3 and 18.8 were found for the dielectric constant. Using the experimental data Kirkwood correlation factors were calculated and presented in dependence of temperature and density.