Comment Re:microwave ovens use dielectric heating (Score 3, Insightful) 82
I also used to think that microwave ovens heated water molecules by resonance but this is a common myth
Resonance, no. But dielectric heating in a microwave oven works with polar molecules. The principal one for this application is water.
Right. But there's nothing special about 2.45 GHz; that frequency is no more highly absorbed by water than any other frequency in the neighborhood.
2.45 GHz is used for microwave ovens because it's the industrial, scientific and medical band, and you don't need a license. And it's easy to make high-efficiency magnetrons at that frequency.