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road games can change the football psi due to the difference in atmospheric pressure. If the Pats fill there balls at Gillette Statium to a set psi where the atmospheric pressure is 14.7 psi and travel to Denver where the atmospheric pressure is 12 psi those footballs will have a lower psi then what was set at Gillette. The same analogy applies when scuba diving where if you fill and tie off a balloon underwater say 60 ft, the pressure will be high in the balloon and when allowed to float to the surface the balloon will get bigger with less pressure inside
just food for thought.
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