"The functional principle of a microwave oven is not related to the resonance frequencies of water, and microwave ovens can therefore operate at many different

"The functional principle of a microwave oven is not related to the resonance frequencies of water, and microwave ovens can therefore operate at many different frequencies. The resonance frequencies of water are about 20 GHz, which would be much too large to penetrate common foodstuffs. Microwave ovens work on the principle of dielectric heating.[88]" https://en.wikipedia.org/wiki/List_of_common_misconceptions#Food_and_cooking https://en.wikipedia.org/wiki/List_of_common_misconceptions#... From Hacker News a couple weeks back.