- Set the hair dryer to cool, switch it on, and point it at the ceiling. - Carefully put the ping-pong ball in the stream of air. Hold the hair dryer very steady and watch as the ping-pong ball floats ...
A ball or other object is suspended in the air stream provided by a reversed vacuum cleaner according to the Bernoulli's principle. Place a ball on top of the vacuum cleaner. Turn on the vacuum.
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