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.
I used to have some melamine plates that would get hot in the microwave.
Melamine is a weird exception. It absorbs microwaves for some reason, which is why it isn't recommended for microwave use.