this post was submitted on 12 Oct 2023
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Improperly aligned waveguide.
Nope, it just doesn't happen. It's an illusion of sorts, the plate isn't being heated because microwaves work essentially on shaking water molecules. Ceramics and plastics are ultra low water content, put a plate in the microwave by itself and it won't be hot.
What you're noticing is the plate heating because the food is heating and the food is transferring heat to the plate, not the other way round.
It's the many tiny air bubbles trapped in low quality ceramics that vibrate and heat it up.
Possibly, feldspar content can have an effect as well in ceramic but in general the plate is not doing the heating or being heated. An ideal ceramic plate or plastic plate doesn't heat until you get real crazy and manage to hit a frequency it likes.