Question

A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle. explain why

Answer 1

Hey user here is your answer :-

Glass expands and contracts due to thermal changes . when heat is applied to the neck of bottle that area slightly expands .
this loosens the stopper . so it becomes easy to remove the stopper which is stuck in the neck of bottle .

hope it helps you !!!!!!!...

Answer 2

Answer:

Glass expands and contracts due to thermal changes. When heat is applied to the neck of the bottle that area expands slightly. This loosens the stopper. So it becomes possible to remove the stopper which is stuck in the neck of the bottle.

When there is an increase in temperature every linear dimension increases by the same percentage. Even if the metal lid and the glass jar are heated equally the lid will become slightly loose because the thermal expansion coefficient of metal is greater than that of glass.