[CAluvdubya]

I just wondered if there were any difference in pressure if the footballs were inflated in one place then, checked 6 hours later someplace else. (or however long it had been between being checked and inflation).

I have a tire/rim problem on my car which creates a very slow leak. I know when I inflate that tire in my cold garage then drive it outside where the sun is shining, the air pressure is different.

[WayneS]

Yes, there can be a temperature-based difference.

There can also be a difference between the readings obtained from two different gages (gage tolerance).

These anomalies are one reason the NFL provides a range of acceptable pressures for the footballs.

I this case, based on the % disparity of the claimed readings, and assuming NFL teams do not typically use cheap plastic junk pressure gages, the under-inflation claimed would almost have to be either intentional, or the result of a defective pressure gage being used to take initial measurements.

[randita]

What you describe would have happened to the12 balls the Seahawks provided as well, but it didn’t. Explain that.