Dear Physics Forum Users Commonly, the relative permittivity of liquid water is reported to be [itex]\epsilon_r = 78.0\epsilon_0[/itex], [itex]\epsilon_0[/itex] being the dielectric constant of the vacuum. For ice (solid water), [itex]\epsilon_r = 4 \epsilon_0[/itex] (heard it in a talk once). Is it correct to interpret the different values in this way that ice is around 20 times less polarizable than liquid water? Which intuitively would make sense. Thanks for comments.