Tea Bag Rocket

Aim:
To observe how warm air rises.

Equipment:
Tea bag,
a lighter.

Method:
1. Cut the teabag open, and unfold it.
2. Pour the tea leaves into a small pile on the ground.
3. Prop the tea bag up on the pile.
4. Light the top of the tea bag with the lighter.
5. Observe.

Results:
When the fire reached the bottom of the tea bag, it rose and fly into the sky.

Discussion:
The teabag rises when the flame reaches the bottom, because hot air is less dense than cool air. As the teabag is set alight, it makes sort of a vaccum of warm air, making the weightless teabag float.