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Phantastic Physics Demos: Levitating A Sphere

A great proof of Bernoulli's principle is to levitate a sphere in a funnel by blowing down on the sphere. The top of a 2 liter soda bottle makes a perfect funnel and the Styrofoam ball should be between 4 and 6cm in diameter.  As a result of Bernoulli's principle, it is possible (with enough air in your lungs) to keep the ball from falling out of the funnel just by blowing down into it.  A video of someone levitating the ball is shown below...

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