How Can you show that air expands on heating?
What is required?
An empty bottle of about 500c.c. capacity, a few balloons, water in a tub, heating arrangement to heat the water.
What to do?
1. Take an empty bottle and fix a balloon tightly at its mouth as shown in figure.
2. Put the bottle in the empty tub.
3. Pour sufficient hot water in the tub.
What do you observe?
As the hot water heats up the bottle the balloon inflates.
How does it happen?In fact on heating the bottle air in the bottle expands and rises up in to the balloon as a result of which the balloon inflates.