Science for Kids Bernoulli's Theorem Experiment:

Video Transcript

Hi! I'm Scott Thompson from expertvillage.com and today I am going to demonstrate Bernoulli's theorem using a soda bottle and a ping pong ball. Well the students will want to know why the ball floats as it does, and you can be prepared to tell them that it is something called Bernoulli's's principle. This gentleman named Bernoulli figured it out and put it writing that when air flows around a curved surface, like a ping pong ball or like a golf ball in an air stream, it picks up speed because it has to go further to meet back up beyond the ball. The funny thing about air, when it goes faster like that, it just doesn't gain in speed but oddly the pressure drops. Fast moving air means low pressure air, so around the outside of that ping pong ball is where the air is going fastest, that is also where the air pressure is the lowest. So air pressure being low on those spots within a cup actually pulls the ball down into the cup as the air is slipping by it. So the harder a big strong student can blow on that ball, actually the tighter that ball is going to stay in the cup.

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