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When liquids expands, it increases in volume

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How thermometers work

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When a something hot flows through the pipe, the pipe will gain heat and expand. Thus, the pipes have to be very flexible in order not to cause the pipes to explode. One way to add more flexibility to the pipes by adding expansion loops.

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Wassup

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When you cannot remove the lid from the jar, you can place only the lid in hot water so that it gains heat and expands or you can place only the jar in cold water so that it loses heat and contracts. When you do either of these suggestions, the lid will be able to be removed easily from the jar.
Expansion and contraction of a jar:

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Tiles are spaced far apart so that on a hot day, they will not crack when they gain heat from the surrounding and expand.

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The telephone towers are placed not too far from one another to allow the wires to gain heat and expand and lose heat and contract.

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On a hot day, when the temperature is high, the bridge will gain heat and will expand. The rollers are placed to allow the bridge to expand without scraping the ground.
On a cold day, when the temperature is low, the bridge will lose heat and contract.
Bridges’ expansion and contraction:

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On a very cold day, train tracks will crack as it loses heat and contract.

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Metal tracks during a hot day