Question

What are the merits and demerits of expansion due to heat?

Answer 1

advantages

1) Sometimes it is difficult to remove stopper of bottle. To do the same one can easily by understanding the concept of thermal expansion. Only you have to do is heat the part of the bottle where stopper is fixed. Because of the expansion in that part, it is very easy to open that bottle.
2) The understanding of the basic concept is highly useful in fixing iron rim with the wooden wheel.
3) We know that rivets are very simple useful tool which is used to hold the steel plates together. The technology here is that the hot rivet is pushed or pivoted through the two plates and then its top is hammered over. And finally when the rivet is in cool position then we get the result that is the two plates are together very tightly.
So this explains the advantages of thermal expansion expansion.

disadvantage

disadvantage of expansion is that roads crack during the cold season because they contract and expand during the hot summer. This expansion can make road surfaces rough. Metal and steel structures used in bridges also expand when they heat up, causing fractures in the bridge.