place a crumpled puece of paper on the mouth of an empty bottle and it comes outside when you blow air inside the bottle.
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Answer:
As you blow into the mouth of the bottle the air is moving fastest - so is at the lowest pressure. Inside the bottle, the air is moving more slowly - so a higher pressure. As the pressure is higher inside the bottle than in the mouth this pushes the paper out!
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It shows air exerts pressure
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