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ICSE Class 8 Physics Question 6 of 19

Heat Transfer — Question 7

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Question

Question 7

Describe an experiment to show that air expands on heating.

Answer

The following experiment demonstrates that air expands on heating:

  1. Take an empty bottle. The empty bottle contains air.
  2. Attach a rubber balloon to its neck as shown in figure.
  3. The balloon is deflated initially.
  4. Place the bottle in a water bath containing boiling water. It heats the air present in bottle.
  5. After sometime it is noticed that the balloon gets inflated as shown in figure.

Conclusion — This shows that on heating, air present inside bottle expands and fills the balloon. So the balloon gets inflated. This shows that air expands on heating.