Aim: To observe convection in a gas.
Convection: Scissors, paper spiral pattern, string, a source of heat ( boiling water, radiator, etc.)
Method:
1.) Cut out the spiral pattern below, carefully following the dashed line
2.) Tie a length of cotton through the hole on the top of the spiral.
3.) Hold the spiral 30-40 cm above a heat source such as a radiator.
4.) observe
Observations:
The hot air is lighter than the surrounding air which makes the paper rise and turn. If there's a cold air the paper won't turn.
Explanation:
It spins if there's a hot air beneath it.
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