Liquid dielectrics that have polar molecules (such as water) always have dielectric constants that decrease with increasing temperature. Why?
Solution 19DQ Step 1 of 1: There is a significant variation of the dielectric constant with temperature for the materials that possess permanent dipoles,. This is due to the effect of heat on orientational polarisation. However, this does not mean that the dielectric constant will increase continually as temperature is lowered. There are several discontinuities in the dielectric constant as temperature changes. First of all, the dielectric constant will change suddenly at phase boundaries. This is because the structure changes in a phase change and, as we have seen above, the dielectric constant is strongly dependent on the structure. Whether will increase or decrease at a given phase change depends on the exact two phases involved.