Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

PVT Relationships

  1. Oct 29, 2011 #1

    db1

    User Avatar

    How do i calculate pressure?

    P1 = 3atm ............. P2 = ?
    V1 = 4 m3...............V2 = 2 m3(half original)
    T1 = 300k...............T2 = 400

    how do i calculate pressure when V2 changes?

    Thanks for any help
     
  2. jcsd
  3. Oct 29, 2011 #2
    You need to give a bit more on the problem? What fluid are you using?
     
  4. Oct 29, 2011 #3

    db1

    User Avatar

    just says a quantity of gas
     
  5. Oct 29, 2011 #4
    I'll assume that they want to use the ideal gas law to solve then.
     
  6. Oct 29, 2011 #5

    db1

    User Avatar

    P2 = 8atm, im just not sure how to work it out
     
  7. Oct 29, 2011 #6
    You have a gas at two states; lets call it state 1 and state 2.

    Ideal gas law is pV=mRT where R is universal gas constant of 8314.

    You have all the parameters for state 1 apart from the mass. Once you know this you will know all the parameters for state 2 apart from the pressure. Plug in the numbers and theres your answer.
     
  8. Oct 29, 2011 #7

    db1

    User Avatar

    its just talking about the combined gas equation PV/T= constant

    it isnt saying anything about m or R yet
     
  9. Oct 29, 2011 #8
    Well then it is even easier!

    PV/t=constant so for state 1, obtain an aswer (this is constant) then rearrange for V and plug in the values for state 2.
     
  10. Oct 29, 2011 #9

    db1

    User Avatar

    have it now, thanks for your help
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: PVT Relationships
Loading...