Question

Why does h2o hv higher dielcletric constant than d2o?

Answer 1

Which physical constant for H2O has higher magnitude than D2O?
That is a very good question.

Heavy water and light water almost have the same physical properties .

But Light water dominates heavy water (in terms of physical constants) in the following cases

Surface Tension
Refractive Index
I Guess , I know only two of them :p