1. Take a bottle with a small neck.
2. Attach a balloon at the neck of the bottle.
3. Place the bottle in a vessel containing water.
4. Heat the vessel and observe the size of the balloon care fully.
5. You observe that the balloon will get inflated, because the air inside the bottle gets heated up and expands.
6. Now stop heating the bottle and remove it from hot water.
7. If needed keep it in cold water and observe the size of the balloon.
8. On cooling, you will observe deflation of the balloon.
9. Here air contracts on losing heat.
10. This activity concludes Gases (Air) expands on heating and occupies more space.
11. They contracts on cooling and occupy less space.
