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 Form 2 Physics Topical Questions and Answers on Fluid Flow

The figure below shows two inflated balloons hanging vertically on light threads. When a stream of air is blown in the space between the balloons, they are observed to move towards each other. Explain this observation.

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Answer Text:
The speed of the air between the balloons increases which reduces the pressure, the higher atmospheric pressure on the sides of the balloons pushes them inwards/towards each other.