Free Illustrations for Physics
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May include some that pertains chemistry, 



Physics Illustrations from Jacopo Bertolotti
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Twitter handle: @j_bertolotti
https://twitter.com/j_bertolotti/status/1030470604418428929

Most of these are animated gifs.

Examples:

* Moire pattern
  https://commons.wikimedia.org/wiki/File:Moire.gif