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Homework Help: Easy: find pressure

  1. Apr 20, 2008 #1
    1. The problem statement, all variables and given/known data
    An automobile tire is inflated with air originally at 10.0°C and normal atmospheric pressure. During the process, the air is compressed to 26.0% of its original volume and the temperature is increased to 32.0°C.
    What is the tire pressure? Pa




    2. Relevant equations
    Pv=nRT P1V1/T1= P2V2/T2


    3. The attempt at a solution

    i used p1v1/t1=p2v2/t2 and got 4.15 Pa but it was wrong
     
  2. jcsd
  3. Apr 20, 2008 #2
    make sure you have the same units for p1 and p2
     
  4. Apr 20, 2008 #3
    yes i checked it. i used 1 atm for the original pressure and then changed it to pa
     
  5. Apr 20, 2008 #4

    alphysicist

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    Homework Helper

    Hi zcabral,

    It's difficult to follow your calculation without knowing the numbers you put into your calculation.

    However, here I think you forgot to include p1 in your calculation. Or did you not convert it? Atmospheric pressure in pascals is about [tex]1.013\times 10^5[/tex] (did you use that number?), so the pressure your getting in your first post is tiny.
     
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