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What happens to the molecules of a substance when they gain thermal energy?

What happens to the molecules of a substance when they gain thermal energy?
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What happens to the molecules of a substance when they gain thermal energy?

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User Ian Vaughan
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When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. ... They contract when they lose their heat.
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User Lotta
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