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When things are heated, the molecules become "excited" This excitement translates into expansion. When cooled the excitement diminishes, causing things to contract.

Basically the same for solids and non-solids. Different things have different degrees of expansion and contraction. Railroad tracks have been known to buckle, and concrete roads have also been known to "explode" when over heated. Bolts work themselves loose on bridges because of changes in heat and cold. ( exacerbated by movement vibration )

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