Bernoulli's Principle Bernoulli's principle states that an increase in ...

Bernoulli’s Principle Bernoulli’s principle states that an increase in the speed of air or fluid is accompanied by a decrease in the pressure of air or fluid. A ball is able to float in the air above the hose of a vacuum due to Bernoulli’s Principle. In the experiment with the ball and shop vac, the increased air speed coming from the hose leads to a decrease in air pressure around the ball. This air pressure decrease causes the ball to hover in the air over the vacuum’s hose. This air pressure decrease also allows the ball to hover diagonally and in a halo over the vacuum’s hose. Bernoulli's Theorem also helps explain why planes and birds can fly. When air moves fast over a bird or a plane's wing, there's an area of lower pressure created above the wing. Because the air pressure above the wing is lower than the air pressure beneath the wing, the bird or the plane can fly.