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Combined Gas Law

  1. May 4, 2015 #1
    I am studying National 5 physics, and my exam is tomorrow. I need some last-minute help.
    I'm struggling a little bit with the combined gas law, P1V1/T1 = P2V2/T2, and I'm not sure why.
    It would help me a lot if you could show step-by-step how the formula is used.
    Thanks for your time, it's very much appreciated.
     
  2. jcsd
  3. May 4, 2015 #2

    Drakkith

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    Staff: Mentor

    Where exactly are you having problems with it?
     
  4. May 4, 2015 #3
    That's the problem: I'm not sure where things are going wrong. I think it may be when I substitute in the values and then have to rearrange the equation, which seems strange because usually rearranging equations is the easiest part!
     
  5. May 4, 2015 #4

    Drakkith

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    I'd suggest finding a homework question and posting it in the homework forums, that way the homework helpers can walk you through it and find out where you're having trouble.
     
  6. May 4, 2015 #5
    Okay!
    Thanks a lot for your time.
     
  7. May 4, 2015 #6

    Drakkith

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    I'm sure I'll stop by your thread later, as we are studying the gas laws in class this week. :wink:
     
  8. May 4, 2015 #7
    Update: I did some exam-style questions on it and I've got it now! I think it was a mixture of me overcomplicating it and occasionally forgetting to convert the temperature into kelvin :smile:
     
  9. May 5, 2015 #8

    Drakkith

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    Yes, I just clarified this with my instructor tonight. Makes sense, otherwise you end up with negative numbers when your temperature goes below zero!
     
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