Question

How extract a tight fitting cork in the neck of a delicate glass bottle?

Answer 1

1. By the thermal expansion, a tight glass stopper from the bottle is removed.
2. Because the glass expands and contracts due to thermal change.
3. 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.

Hence a tight-fitting cork can be extracted by heating the delicate bottle.