Question

Why is there a gap at the joints of the railway and of concrete?

Answer 1

Answer:

because solids expand while heated.

Answer 2

Answer:

Explanation:

Metals expand due to heat and contract when cooled

So during summer the railway tracks will expand due to the heat.

If there is no gap between tracks , the tracks will overlap each other when expanded and trains will suffer an accident.

Therefore there is a gap between the joints to prevent this

Hope this answer helped