I understand that as a solid melts, it increases can increase in polarizability of the medium, and increase the Dielectric constant (K). -ex. like dissolving NaCl and having ions in solution. Why does Thermal motion reduce the polarizability of the medium, thus decreasing the dielectric constant? Is it because when a strongly polar medium respond to an external electric field, the medium reorienting its polar molecules so that the net electric field within the medium becomes weaker than the external field?