Dielectric constant of water from 0 to 100 C

An equal ratio arm, capacitance-conductance bridge, operated at frequencies below 100 kilocycles per second, was med to measure the dielectric constant of water with an accuracy of better than 0.1 percent at 5-degree intervals over the range .0 to 100 C. At 25 C the dielectric constant was found to have the value 78.30, which is about 0.3 percent lower than t hat usually accepted. The data fit the equation E= 87. 740 -0.400081+ 9.398(10-4) tL 1.410 (10-6 )13, with a maximum deviation of 0.01 unit in dielectric constant. The experimental method and sources of error are considered in some detail.