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Airfoil

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Air Pressure

How does things float? Like, leaves flying in the fall, air planes in the sky. Bernoulli's Theorem states that when ever a liquid or gas moves parallel to a surface, there will be a reduction in the pressure on the surface. We are surrounded by air pressure in every direction, just like a peice of paper on the table. If you blow across the top of the paper, you pushed the air pressure away making the pressure on the bottom of the paper greater. So the paper floats. Just like the shape of an airplanes wing, the pressure on top is less than the pressure on the bottom, which gives its lift. And that is called air foil.

Contributed by Monica Baltish

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