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WHAT CAN WE DO ABOUT AIR PRESSURE? There are several activities that will help you realize that air pressure can be reduced by rapidly moving air. a. Place a ping-pong ball in a funnel, hold the funnel stem downward, and blow up through the stem. You will be surprised to find that you cannot blow the ball out of the funnel. Next, while holding the ball inside with one hand, turn the funnel stem upward. At the same time, blow through the funnel stem and release the ball. (As long as you are blowing, the ball should not fall.) The quickly moving air over the ball creates a low pressure area behind it, and the normal air pressure is enough to hold the ball in place. Similarly, when air moves rapidly across the surface of the earth, low pressure areas result. b. Put a pin through the center of a 3 inch square of cardboard. Insert the pin in the hole of a spool of thread. Hold the cardboard beneath and flat against the spool. Blow through the spool, and remove the hand holding the cardboard. The card will remain in place due to the decreased air pressure above the card; the normal air pressure is sufficient to hold the card against the spool.  Any problems with this page? Send URL to
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