Answer:
Take two paper bags or empty paper cups of the same size. Hang the two bags in the inverted position on the two ends of a metal or wooden stick. Tie a piece of thread in the middle of the stick. Hold the stick by the thread as in a balance. Put a burning candle below one of the bags. As the warm air rises up, it pushes the bag above the candle. This activity proves that warm air is lighter than cool air.
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