Question

a glass stopper sturk in the neck of a bottle can can be removed by pouring hot water on the neck of the boat water explain why? plese give the answer.

Answer 1

Hey,

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 lineardimension 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.

HOPE IT HELPS:-))