bridges are mounted on rollers. why
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iron bridges are mounted on steel rollers because it expand on heating and contract on cooling.so ,leaving a small space in between for the expansion and contraction.Thus ,the bridge is saved from collapse.
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iron bridges are mounted on steel rollers because it expand on heating and contract on cooling.so ,leaving a small space in between for the expansion and contraction. Thus ,the bridge is saved from collapse. In a construction of a bridge, Steel girders are used.
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