1. The problem statement, all variables and given/known data A car tire gauge is used to fill a tire to a gauge pressure of 42.5 lb/in2 on a cold morning when the temperature is -16 C. Atmospheric pressure is 14.7 lb/in2 and 0 C = 273 K. What would the tire gauge read when the tire has been heated up to 44.2 C? 2. Relevant equations P2 = P1 (atmospheric pressure) + ϱgh (gauge pressure) PV= nRT P1/T1 = P2/T2 3. The attempt at a solution P2 = (14.7 lb/in2 + 42.5 lb/in2) = 57.2 lb/in2 I don't really know if this is even the right first step. I just recognized that gauge pressure is ϱgh. What should I do next?