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Question

What happens when we blow up the balloon by mouth?

A
The air inside the balloon exert outward pressure on the balloon.
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B
The atmosphere exert inward pressure on the balloon.
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C
The air inside the balloon exert inward pressure on the balloon.
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D
The atmosphere exert outward pressure on the balloon.
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Solution

The correct option is B The atmosphere exert inward pressure on the balloon.
We blow the air from our lungs into the balloon, so that the air can go inside the balloon. The air present inside the balloon exerts outward pressure on the wall of the balloon. To balance this pressure, the air present oustide exerts an inward pressure on the wall of the balloon.


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