Describe the effects of expansion and contraction of solids.

Describe the effects of expansion and contraction of solids.
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Answer :

I. In hot summer, concrete in roads expands and road surface crack. II. Two sections of railway track are laid with gaps. If there are no gaps, then they may be de-shaped due to expansion in summer. III. In bridges, one end of the iron girder resets on the rollers. A gap is also present at this end. So that it can move forward and backward during expansion and contraction.
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