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The air flowing above has less pressure, and thanks to this phenomenon, we have lift. The curved top of the airfoil will actually force the air to move between a smaller area. When a fluid moves through a smaller area, it speeds up, and fast air has low pressure. This is Bernoulli's principle. The air above the wing will have less pressure.

The air underneath the wing has more space, so it moves more slowly and has higher pressure. The high pressure air pushes up the wing, and produces lift!