1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Gas Compression Temperature Change

  1. Feb 23, 2017 #1
    1. The problem statement, all variables and given/known data
    "One way to heat a gas is to compress it. A gas at 1.00 atm at 25.0°C is compressed to one tenth of its original volume, and it reaches 40.0 atm pressure. What is its new temperature?"
    So, I have:
    P1 = 1
    V1 = 1
    T1 = 25
    P2 = 40
    V2 = 0.1

    And I'm looking for T2
    The question was multiple choice: 1500K, 919 degrees C, 1500 degrees C, and 1192 degrees C.
    I'm getting 100 degrees C.

    2. Relevant equations
    I've been using the equation: P1V1 / T1 = P2V2 / T2

    This gives me
    T2 = T1(P2V2)/(P1V1)

    3. The attempt at a solution
    When I put in my numbers, it gives me:
    T2 = 25 (4/1)
    = 100 degrees C

    This isn't one of the options, but I can't see where I have gone wrong.

    If I convert everything to Kelvin, I get 1192K, which is still not quite right due to the units.

    Any and all help would be highly appreciated. Am I using the wrong equation, or have I simply missed something?
  2. jcsd
  3. Feb 23, 2017 #2


    User Avatar
    Homework Helper
    Gold Member
    2017 Award

    Hello. Welcome to PF!
    T is absolute temperature in this equation. So, T should be in K. Once you get your answer in K, you can convert to oC.
  4. Feb 23, 2017 #3
    What do you get if you convert your 1192K to Celsius?
  5. Feb 23, 2017 #4
    919... I feel ever so silly, thank you.
  6. Feb 23, 2017 #5
    Thank you for your help
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted