Procedure:
Aim the hair dryer straight up and turn it on. Gently
place the ping pong ball in the airstream and let it go, you
should be able to keep the ping pong ball floating in the airstream
above the hairdryer. With a little practice, you should be able
to keep the ball in the airstream even if you hold the hairdryer
at an angle!
Explanation: Generally speaking, the greater
a fluid’s velocity, the lower its pressure. So the high
velocity air exiting the hair dryer is at a lower pressure than
the surrounding, low velocity/high pressure air. This surrounding
high pressure keeps the ping pong ball in the low pressure/high
velocity air above.
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