Describe an activity to demonstrate that warm air is lighter than cool air

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cbse-class-7-science
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#1

Describe an activity to demonstrate that warm air is lighter than cool air.

Answer:

Activity:
image

  • Take two paper bags of the same size and hang them in inverted position on the two ends of a wooden stick.
  • Tie a thread in the centre 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.