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IA help: how to figure out what 1 pump is in psi

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I'm doing an air pressure experiment for my IA (second attempt as my previous topic was a bit too complicated). I basically increase the air pressure in a football and drop it from a fixed height. I pump it once and then drop it 3 times from 2m, again and again until the ball is fully inflated. My teacher said that it wouldn't be easy figuring out how much air pressure I'm adding per go so it was better to first do the experiment and work it out later.

 

I can't find any sites that discuss this, so how do I figure this out? Do I take the ball's max air pressure - 8 psi and divide that by the amount of pumps it took to inflate it all the way?

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I can't find any sites that discuss this, so how do I figure this out? Do I take the ball's max air pressure - 8 psi and divide that by the amount of pumps it took to inflate it all the way?

hey that's a great idea, never thought about that :P but typically bike pumps should have some value written on the pump as to how much air it pumps in one go.

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