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 Form 1 Physics heat transfer topical questions and answers

A paper windmill in a horizontal axis was placed above a candle as shown in figure 2. When the candle was lit the paper windmill begun to rotate. Explain this observation.

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Answer Text:
- The flame heats the air above it which becomes less dense and rises. This rising air creates a convectional current that causes the blades to turn in a clockwise direction.