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COOL HOT ROD
demonstrates that most materials expand when heated and contract
when cooled. A long aluminum pipe can be heated or cooled by the
visitor and its movement observed on an indicating dial, proving
this principle. At higher temperatures, atoms vibrate more and take
up slightly more space. A familiar application of this principle
is the inclusion of expansion joints in bridge roadways. These gaps
allow the bridge to expand and contract without cracking.
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