This is a perfect, real-time demonstration of Bernoulli’s Principle. When the student blows air through the narrow funnel, that air speeds up, just like fluid narrowing through a pipe. And when air speeds up, its pressure drops. That creates a low-pressure region inside the funnel, especially between the curved inner walls and the ball. Meanwhile, the surrounding air outside the funnel still has higher pressure. This results in a higher external pressure that actually keeps the ball trapped insi