miso@sushi.com wrote:
> Isn't there some magic relationship between H2O and 2400Mhz? Like water
> absorbs the 2.4G RF most efficiently, and thus microwave ovens use this
> frequency.
>
> Wifi isn't all that far away in frequency.

Actually that's urban myth. Microwave ovens use 2.4 GHz because its in the
unlicensed ISM band.

[snipped from http://www.answers.com/topic/microwave-1]

Microwave heating is sometimes incorrectly explained as a rotational
resonance of water molecules, but this is incorrect: such resonance only
occurs at much higher frequencies, in the tens of gigahertz. Moreover,
large industrial/commercial microwave ovens operating in the 900 MHz range
also heat water and food perfectly well.

Also,
http://en.wikipedia.org/wiki/Microwave
http://www.zyra.org.uk/microw.htm