For this experiment you will need:
Firstly, you need to blow a balloon and tie the end. Then hold the balloon above your head then release it and try to keep it in the air by blowing it. Take note of the result. Next, follow the same steps but this time using an electrical hair dryer to keep the balloon in the air. This time, you will be able to keep the balloon in the air, but not for long, because the dense air will make it fall. In the next experiment you will see that the balloon is floating because the hair dryer is decreasing the pressure in the air causing it to float. The same can be observed using a hair dryer and table tennis ball.