Materials Required:
l Round balloon
l String, 1 foot long
l Faucet
Procedure:
- Inflate a round balloon and tie the opening with the piece of string.
- Turn on the faucet at full force to produce a rushing stream of water.
- Hold the end of the string and allow the balloon to hang freely. Slowly move your hand toward the faucet so that the balloon comes close to the water. As the balloon is drawn toward the water stream, pull your hand away slowly. The balloon will remain against the water jet and begin rotating.
This Is What Happens:
The force of the water stream rushing into the sink creates an area of low pressure around it. Because the balloon is very light, it is pushed into this area by the surrounding air of higher pressure. The push of air on the rounded surface causes the balloon to spin.
