Aim:
To observe convection in a gas.
Equipment:
Scissors,
paper spiral pattern,
string,
source of heat.
Method:
1. Carefully cut out the paper spiral pattern.
2. Tie a length of cotton through the hole on the top spiral.
3. Hold the spiral 30-40cm above a heat source such as a radiator.
4. Observe.
Results:
The paper spiral twirled around as the hot air rised up and ran along the spiral.
Discussion:
The hot air is less dense than the cool air, so it rises up to the paper spiral. As the hot air ran along the spiral, the hot air effectively pushed the paper, making it twirl.
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