Chemistry
posted by Lauren .
the air in a steel belted tire is at a gauge pressure of 29.8 psi at a temperature of 20 degrees celsius. After the tire is driven out fast on a hot road, the temperature in the tire is 48 degrees celsius. What is the tires new gauge pressure.
Can someone please explain this step by step for me? thank you =)

Use (V1/T1) = (V2/T2)
Don't forget T must be in Kelvin. 
but do you have to do something special since its gauge?

I don't have the slightest idea why I wrote that formula. There is no volume to be found but I stuck volume in the equation. I should have written
P1/T1 = P2/T2.
Since the problem starts with psig and ends with psig, I don't think the units should be changed.
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