Which states Bernoulli's principle?

Bernoulli's principle states that an increase in the speed of a liquid results in a decrease in pressure, and a decrease in the speed of a liquid results in an increase in pressure. This principle can be used to explain why airplanes are able to gain lift and fly. The wing of an airplane is designed to allow air to move at a faster speed over the top of the wing and a relatively slower speed across the bottom of the wing. This differential in the speed of the air over the wing and beneath the wing results in a low pressure above the wing and high pressure below the wing, causing lift and allowing the plane to fly.