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You can experience this effect yourself by conducting a simple experiment. Just hold a strip of paper against your lower lip and blow hard on it. You will notice that the paper is drawn upward. The fast-flowing air produces a low pressure, and the paper is drawn upward by suction.
Our explanation would not be complete if we failed to mention something else that happens on the wing: The air flowing over the wing generates a vortex at the rear edge of the wing. This results in a counter-vortex, which, in turn, brakes the air flowing below the wing so that the pressure there increases even further and intensifies the lift.
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