Air Expands on Heating


 
 
Concept Explanation
 

Air Expands on Heating

Air Expands on Heating:

We live on the earth which is surrounded by air. The layer of air surrounding the earth is called atmosphere.

Air expands on heating can be explained with the help of following experiment.

Aim: To show that air expands on heating

Material Required:

A small balloon, two buckets/mugs, hot water, and ice

Procedure:

  •  Blow air into the balloon so that its surface becomes smooth.
  •  Place the balloon in very cold ice water in a bucket/mug and leave it for some time. Observe what happens to the material of the balloon.
  •  Now take some very hot water (the water should be as hot as you can bear to touch) in a bucket/mug and place the balloon in it for some time.
  • Observation:

    When the balloon is placed in ice-cold water, it develops wrinkles. The wrinkles disappear and the balloon gets back its shape when it is placed in hot water.

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    Sample Questions
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    Question : 1

    Air ________________on heating.

    Right Option : A
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    Question : 2

    Which of the following are correct ?

    (a) The layer of air surrounding the earth is called atmosphere.

    (b) The gas thermometers are based on the fact that gases expand on heating.

    (c) If we place a hot air balloon over cold water, the air inside it cool down so it contracts.

    Right Option : D
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    Explanation
    Question : 3

    Which of the following will rise the highest ?

    Right Option : B
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