Folks, I am looking for a more intuitive explanation of why water is transparent in the visible range. I am looking for the mechanism -- clearly it is transparent because photons are not absorbed. However, I am clueless as to why water should strongly absorb microwaves due to its polarity but fail to do the same for visible wavelengths. Can any one point me in the right direction, please? I have read that visible light is "too energetic", but water clearly absorbs some even higher frequencies, too.