Question

Why are iron bridges mounted on steel rollers? question/ answere
​

Answer 1

Answer:

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.

Answer 2

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.