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 Form 2 Physics Topical Questions and Answers on Fluid Flow

The figure below shows a pith ball placed in a flask. When a jet of air is blown over the mouth of the flask as shown, the pith ball is observed to rise from the bottom. Explain this observation.

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Answer Text:
The fast moving air in the mouth of the flask creates a region of low pressure. The higher atmospheric pressure acting on the pith ball then pushes it up.