explain an activity to show that warm air is lighter than cold air with the help of two paper bags

  1. 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.
  2. Tie a piece of thread in the middle of the stick. Hold the stick by the thread as in a balance.


  3. Put a burning candle below one of the bags.
  4. 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.



  • 18
What are you looking for?