1. Why is the one end of metal girder bridge not fixed?
 2. What will happen if boiling water is transferred to the
same container , it was earlier in? Explain the reason behind
 3. What are expansion gaps with regards to train tracks?

Dear Student
The solutions to your 1st and3rd query have been provided below:
​​​​1. When temperature increases, the metal girder bridge expands and the rollers slide to allow for expansion otherwise the bridge may break the pillar. That's why one end of metal girder bridge is not fixed.
3. The gaps left between successive rails on a railway track because the rails expand in summer. The gap is provided to allow for this expansion. If no gap is left, the expansion in summer will cause the rails to bend sideways. That will result in train accidents.​​​
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