Question

Expansion on heating can be of nuisance . Give some examples

Answer 1

Due to high temperature in summer , the railway tracks expand and this may cause irregular shape or might change the shape which will affect the movement of the train... 
(high temperature in summer) thermal expansion 

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Answer 2

1) toothache- when we drink some hot drinks our tooth expands & it causes toothace so it is a disadvantage of thermal expansion