Bernoulli Blower

What?  A ball floats in a fast-moving stream of air.  A scientist named Daniel Bernoulli helped us to understand how this works.

Why?  As air passes through the fan in the base and through the tube on top, it goes faster. According to Bernoulli’s explanation, a stream of fast moving air will have lower pressure than the still air surrounding it.  The still air surrounding the air stream creates a “wall” of high pressure that helps to keep the ball from falling out.

Curious?  Try slowly pulling the ball out of the air stream.  Can you feel the pull of the low pressure zone? What happens when you put more than one ball inside the air stream?