. Write an activity to demonstrate that moving air provides a lift.
Answers
Aim: To show that air expands on heating
Materials needed: A small balloon, two buckets/mugs, hot water, and ice Method: ‘
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.
Conclusion: The balloon develops wrinkles because the air inside the balloon contracts. It gets back to its original shape when it is heated because the air inside the balloon expands.
Explanation:
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