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Message: [QUOTE="JKinUtah, post: 5199962, member: 243"] “A regulation football is inflated to 13.5 psi. Ideally, you want your kick to decrease the size of the ball by 1/3 which, by Boyle's Law, will increase the pressure by ~30%. That force is being exerted on the top side of the ball facing away from the kicker. You want an efficient energy transfer between the foot and the back side of the ball bladder. The laces and stripes are stitched on. This means that there are holes in the leather where they are attached. If the laces are out, the bladder can expand into these holes which means the volume of air increases, and the pressure decreases. Obviously, the effect is negligible, but it is interesting.” Science……. [/QUOTE]