Question

Take a dry Bottle having a rubber stopper.Fix an empty refill through the rubber stopper.Fill a drop of ink into in the lower end of the refill tube ,then close the bottle .Dip this arrangement in liluke warm water. what do you observe??​

Answer 1

Answer:

When the hot water is poured over the neck of the bottle, it expands. As a result the stopper gets loosened and can be removed easily