what changes take place during the expansion of material?
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When substances expand or contract, their particles stay the same size. It is the space between the particles that changes: the particles in a solid vibrate more when it is heated, and take up more room. the particles in a liquid move around each other more when it is heated, and take up more room.
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Materials expand or contract when subjected to changes in temperature. ... The expansion and contraction with changes in temperature occur regardless of the structure's cross-sectional area. Concrete expands slightly as temperature rises and contracts as temperature falls.
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