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This process is called thermal expansion. When metal is heated, the increased kinetic energy of its atoms causes them to vibrate more, leading to an increase in spacing between atoms and a larger overall size. When the metal cools, the atoms lose kinetic energy, causing them to contract and the metal to shrink.

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Q: When metal is heated it gets bigger but when it cools it gets smaller - what is this process called?
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Related questions

When an solid is heated does it go bigger or smaller?

bigger.


If a coin has a hole cut in it does the hole get bigger or smaller or stay the same when the coin is heated?

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When water is heated rapidly changes into steam this process is called?

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