Question

18. How can you prove, with the help of an experiment that the hot air is lighter than the
cold air?
​

Answer 1

Answer:

Tie a thread in the center of the stick and hold the stick by the thread to balance it. Place a burning candle below one of the bags. The bag above the candle goes up, as the air above the candle becomes warm, it rises and pushes the bag up

Explanation:

Hope it helps u...

Answer 2

Answer:

Take two cups and tie them at the two ends of a stick.Ensure that you kept those paper cup with some distance away from the flame of the candle. The cup with the candle below it will raise up due to the hot air. This proves that hot air is lighter than the cold air