this post was submitted on 12 Oct 2023
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[โ€“] [email protected] 2 points 11 months ago (1 children)

It's the many tiny air bubbles trapped in low quality ceramics that vibrate and heat it up.

[โ€“] [email protected] 0 points 11 months ago

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.