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Response to ProfessorGAC (Reply #46)

Mon Apr 13, 2020, 09:48 PM

53. Also, the notion that microwave ovens are "tuned to water" is a popular myth

 


Itís simply not true. They are broadband radiators.

https://wtamu.edu/~cbaird/sq/mobile/2014/10/15/why-are-the-microwaves-in-a-microwave-oven-tuned-to-water/

So how do microwaves in an oven heat food if they are not tuned to a specific resonant frequency of water? They heat the food through simple dielectric heating. In dielectric heating, the electric field in the electromagnetic wave exerts a force on the molecules in the food, causing them to rotate in order to align with the field. Because of this rotating motion, the molecules collide into each other and convert their somewhat ordered rotational motion into disordered motion, which we macroscopically call heat. Many types of molecules in the food absorb energy from the microwaves in this way, and not just water molecules.

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