HERE'S HOW
Hold the edge of a sheet of paper under your lower lip. Blow hard over the paper. It should blow up, not down!
WHY?
Fast-moving air blowing over the paper creates less pressure on the paper than the slower air that is under it. The greater pressure under the paper creates an upward force called lift. This illustrates Bernoulli's principle. It is the same force that keeps airplanes and birds in the air.
BOTTLES & BALLOONS »
Illustration by David Bamundo
Text by Julie Vosburgh Agnone
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