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I don't know for sure - but here is my guess. Please shoot me if I am wrong.

 

When copper is cooled down - the metal contracts. I don't see how it could contract unless the atoms were getting more closely packed together. As it heats up, the atoms would vibrate more and the distance between them would increase and the overall parameters of the piece of metal expand.

 

I'm sure it's more complex than that - but that would be my 'off the top of my head' guess. Would need to look it up for actual real world scientific answer (not DrP's imaginary world answer).

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  • 1 month later...
:P Hi guys!!

 

New question: Is atomic spacing constant?, take copper in example.

 

If it's not what is the explanation of those changes in general?

 

Nope. Depends on temperature, pressure, crystal structure, etc.

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