Blow up the balloon and tie it.
Rub it against your hair on top of your head.
Watch what happens! Your hair will stick up!
Static electricity.When you rub the balloon on your hair, you’re covering it with little negative charges. Now that each of the hairs has the same charge, they want to repel each other. In other words, the hairs try to get as far away from each other as possible. The farthest they can get is by standing up and away from each other.