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Can I use psi for air pressure as a unit in my IA?

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So I handed in my final IA draft today because it was our deadline for it, and something that just occurred to me now is that I used psi as a unit for air pressure inside a football (my experiment) and that may not be the right one to use. I went for psi because it was the most commonly used unit in all the sources I found on physics of a ball's rebound.

 

I'm worried I just ****ed it up though. Also do I now have to change all my values for pressure so that's converted to Pa?? My teacher went over my IA and he didn't see anything wrong with it (and he's a harsh grader). What do I do????

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It's ok as long as all calculations are valid. For example if you use the gas constant that has units in atm then the calculation is not compatible. I think they can allow psi as a unit, just like mmHg is much easier to understand than pascal. 

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