Question

write down the problem cause by expansion and contraction How these problem overcome​

Answer 1

Answer:

due to expansion in summers the rails of railway lines can get turned/buckled.

due to contraction electrical cable lines can get snapped due to contraction in winters.

to overcome these problems we leave space for expansion of rails during summer and we keep electrical cable sagging while installing in summers to avoid breaking during winters due to contraction.

Answer 2

Answer:

When substances expand or contract, their particles stay the same size. It is the space between the particles that changes: the particles in a solid vibrate more when it is heated, and take up more room. the particles in a liquid move around each other more when it is heated, and take up more room.