What does Bernoulli's principle state about fluid movement?

Bernoulli's principle describes the behavior of fluid flow, specifically the relationship between velocity and pressure. It states that within a flowing fluid, an increase in velocity occurs simultaneously with a decrease in pressure. This principle helps to explain various aerodynamic phenomena, including how lift is generated on an airfoil.

When air moves over the curved surface of a wing (the airfoil), it travels faster over the top surface compared to the bottom surface. According to Bernoulli's principle, this faster-moving air on the top surface results in lower pressure compared to the pressure on the bottom surface of the wing. This difference in pressure creates an upward force, which is known as lift, allowing the aircraft to rise.

Understanding this principle is essential for pilots as it provides insight into flight dynamics and the aerodynamic forces acting on an aircraft. It also emphasizes the importance of airflow speed around the wings and how it directly influences the pressure exerted on those surfaces.