What happens to the pressure on a wing's upper surface as speed increases?

When the speed of airflow over a wing's upper surface increases, the pressure decreases. This phenomenon is a result of Bernoulli's principle, which states that an increase in the velocity of a fluid results in a decrease in pressure in that fluid. As an airplane wing moves through the air, the shape of the wing (airfoil) is designed to create a difference in airflow speed between the upper and lower surfaces.

As the aircraft accelerates, the air moves faster over the top surface of the wing, leading to lower pressure compared to the slower-moving air beneath the wing. This pressure differential is what generates lift, allowing the aircraft to rise. Therefore, as speed increases, the pressure on the wing's upper surface decreases, facilitating the lift necessary for flight.