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Originally Posted by dlavery
Before you spend too much time on this idea, try this simple test: put your mouth on the ball, making a reasonably tight seal against the surface, and blow. Surprising, isn't it?
-dave
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I can't get my mouth to fit around the 7" ball.
But, I think your point is, if the ball has a tight seal and is restricted from moving until the pressure builds sufficiently*, then some surprising force can be generated.
*Sufficient = you do the math
Don