Why don't you look at this link. I think it will prove your understanding is incomplete, and that water does have significant absorption in the microwave regio

Why don't you look at this link. I think it will prove your understanding is incomplete, and that water does have significant absorption in the microwave region of the spectrum. https://en.wikipedia.org/wiki/Electromagnetic_absorption_by_water#Microwaves_and_radio_waves https://en.wikipedia.org/wiki/Electromagnetic_absorption_by_...