A natural decrease in temperature would have caused the New England Patriots’ footballs to become under-inflated Sunday, a Boston College physics professor says. Michael Naughton, chair of the physics department at BC, said in a press release “it’s not possible for weather not to have played a role” in the DeflateGate controversy. He claimed footballs always lose or gain pressure depending on the conditions. “Say you inflate the ball to 12.5 PSI — the NFL minimum — in a room at 70 degrees, and then used the ball outside where it was 50 degrees. That 12.5 PSI would eventually become 11.5 PSI,” Naughton said. “If you inflate the ball to 12.5 PSI in an even warmer room where it was, say, 80 degrees, and then played outdoors at 40 degrees, that 12.5 PSI would become 10.5 PSI — a drop of two PSIs.”