There's not THE resonant frequency of water, there are a lot of them, in different regions of the spectrum, and with different widths, all caused by different m

There's not THE resonant frequency of water, there are a lot of them, in different regions of the spectrum, and with different widths, all caused by different mechanism by which water-molecules can interact with electromagnetic waves. http://en.wikipedia.org/wiki/Electromagnetic_absorption_by_water http://en.wikipedia.org/wiki/Electromagnetic_absorption_by_w... And the one responsible for absorption in the ~1GHz region isn't even related to any resonance whatsoever, as it's caused by rearrangements of the unordered electrostatic bindings between the polarized water molecules. There's even more detail at: http://www1.lsbu.ac.uk/water/microwave_water.html http://www1.lsbu.ac.uk/water/microwave_water.html