[SOLVED] Ideal Gas Law Application 1. The problem statement, all variables and given/known data One Sunday morning a family takes an automobile trip to Grandma's. At the start of the trip, the temperature is 288K (15C), and the gauge pressure in the tires is 32lb/in^2 (psi). (The gauge pressure is the excess over 14.5 psi, the exterior air pressure.) After an hour's ride over an interstate highway, the gauge pressure in the tires is 38 psi. What is the temperature of the air in the tires, assuming that air behaves as an ideal gas? Neglect any changes in volume of the tires. 2. Relevant equations PV=nRT 3. The attempt at a solution 3. After working around with the universal gas law, the forumla I used is: T2=(P2*T1)/P1 T2=(38/32)*288=342K 342-273=69C The textbook gives the answer 52C. What am I doing wrong? Did I use the wrong units?