SCIENCE FROM JUNK - MAKE A TEA BAG ROCKET

by 12:26 0 comments
This is a classic experiment, once you've done this you can claim to be a rocket scientist!

YOU WILL NEED:
1. A teabag
2. Matches

INSTRUCTIONS:

1. Remove the staple from the teabag.
2. Empty the tea out.
3. Straighten the teabag out and open it up, so it forms a circular cylinder or a diamond shape
4. Stand the cylinder on the plate.
5. Light the top of the cylinder.
6. The fire will burn down the cylinder. As it nears the bottom, the teabag will lift up into the air and float towards the ceiling.

WARNING : ADULT SUPERVISION IS NECESSARY AS IT INVOLVES FIRE!

You just created a working model of how Hot Air Balloons work!



SCIENCE BEHIND:

Lighting the top of the teabag cylinder heats the air inside the cylinder. The air molecules start to move more quickly and spread out to take up more space. As the air molecules spread out, the air inside the cylinder becomes less dense. Warm, less dense air rises above cool, dense air. The ash of the teabag is light and doesn't require much force to lift it. As the warm, less dense air rises, it has enough force to lift the ash of the teabag.
This experiment also demonstrates the principle of convection currents. As we just explained, the burning bag of tea creates hot, less dense air. This creates a thermal, or convection, current. The space created by the less dense air inside the cylinder allows the dense air outside to push upwards from the bottom. That movement or current of air is referred to as a convection current.

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