It is demonstrated that in a wide range of values of the parameters th
e experimental values of the dielectric permittivity of water are a li
near function of the ratio of the density to the temperature. It is sh
own that this dependence cannot be obtained within the existing molecu
lar-statistical methods of calculation. A method is proposed for extra
polating to high temperatures and ultrahigh pressures. A method is pre
sented for estimating the experimental results obtained.