Ans. Bernoulli's principle states that as the speed of a fluid increases, its pressure decreases. This principle explains the lift generated by an airplane wing, known as the Bernoulli lift. When an airplane moves through the air, the shape of its wing causes the air above it to move faster than the air below it. According to Bernoulli's principle, the faster-moving air above the wing exerts less pressure compared to the slower-moving air below the wing. This pressure difference creates an upward lift force, allowing the airplane to stay airborne.