I wrote a short piece on the “Deflategate” controversy for the US edition of The Conversation, and whether physics could explain the underinflated footballs used by the New England Patriots:
News reports say that 11 of the 12 game balls used by the New England Patriots in their AFC championship game against the Indianapolis Colts were deflated, showing about 2 pounds per square inch (psi) less pressure than the 13 psi required by the rules, so it seems that the most bizarre sports scandal of recent memory is real. But there are still plenty of questions: why would a team deflate footballs? Could there be another explanation? And most importantly, what does physics tell us about all this?
As part of the story, I did an experiment, putting a couple of footballs in the freezer and measuring the change in pressure. I described that in more detail on my blog.