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bernoulli's principle
In simple terms, if a fluid is flowing through a pipe, as the radius of the pipe decreases the speed of fluid flow must increase and visa-versa.
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A common example of Bernoulli's principle is the water tank with a hole is the side. This demonstration simulates that example. A cylindrical column with two holes in its side is filled with colored water. As the water flows out of the holes it falls in a parabolic trajectory as shown in the figure below.
The reason the ping pong ball stays in the funnel when you blow in it is because of Bernoulli's Principle. This principle states that as the speed of a moving fluid (liquid or gas) increases, the pressure within the fluid decreases. When you blow in the funnel at a high speed, the pressure around the ball decreases. Then, the pressure from the outside of the funnel (because there is air pressure everywhere) pushes down on the ball at a lower speed, which would mean higher pressure, which causes the ball to stay inside the funnel. Mind you that the bernoulli's principle is based in the wind tunnel or venturri tube and the funnel is an example of a venturri tube, so that would further explain it.