I believe this....if you check the balls at pregame inspection and all balls are either set or already at 12.5 psi with a specific pressure gauge then you recheck them at half time or post game with that same pressure gauge. To me that would be the most accurate way to compare the pressure drop.
As to the .3 to .45 variation between the 2 different pressure gauges no where did the wells report state which gauge was accurate.
I have read the wells report and also have seen how the team and Brady is not letting this drop. The wells report
is 95% rubbish. I believe that Brady asked for 12.5 psi and nothing less than 12.5.
Regarding the ideal gas law you can read this link or google search it for your self.
http://www.bostonglobe.com/metro/20...ooler-place/2KfFPHn9dARXXCwMgBMSkO/story.html
HeadSmart Labs, a Pittsburgh research company working on preventing head injuries from sports, said that it conducted a study that found weather and field conditions alone could have lowered the pressure by as much as 1.95 psi. “We took 12 brand-new authentic NFL footballs and exposed them to the different elements they would have experienced throughout the game,” said Thomas Healy, founder of HeadSmart Labs, in a press release. “Out of the 12 footballs we tested, we found that, on average, footballs dropped 1.8 psi when being exposed to dropping temperatures and wet conditions.”