explain an activity to show that warm air is lighter than cold air with the help of two paper bags
- Take two paper bags of the same size. Hang the two bags in an inverted position on the two ends of a metal or a 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.
- The balance gets disturbed, with the bag with candle below it rising up. As the warm air is lighter than cold air, it rises up, pushing the bag above.
