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^ fifa guidelines say pressure equal to 0.6 – 1.1 atmosphere (600 – 1,100 g/cm2) at sea level or 8.5 – 15.6 psi.
http://quality.fifa.com/en/Footballs/Quality-Programme-for-Footballs/Laws-of-the-Game/
Between 8-15, Wow.
That's a huge discrepancy. Players would want the maximum I presume, GK's other way around.