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Homework Help: Pv diagrams

  1. Jun 15, 2008 #1
    PV diagrams.
    a DIAGONAL straight line going down (negative slope) on a PV digram with P on y axis and v on x-axis.

    The temperature of the gas ______________.
    Decreases then increase
    Increase then decrease

    At first I chose remains constant... but it was wrong. I tried to plug it in to the Ideal gas Law formula, and i get T to decrease the entire way. but that isn't a choice.
  2. jcsd
  3. Jun 15, 2008 #2


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    Welcome to PF!

    Hi get_physical ! Welcome to PF! :smile:

    Hint: what would be the shape of the pv curve if the temperature was constant?

    draw several curves (on the same graph paper) for different constant temperatures …

    how does the diagonal line cut those curves? :smile:
  4. Jun 15, 2008 #3
    thankyou tiny-tim!
  5. Jun 15, 2008 #4
    how do i mark this as solved?
  6. Jun 15, 2008 #5


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    Hi get_physical! :smile:

    (sorry I didn't reply earlier … I'm not getting email notification of replies at the moment … are you getting them?)

    Normally, you click "Thread Tools" at the top … but it got de-activated in the latest upgrade … see https://www.physicsforums.com/showthread.php?t=240061&highlight=solved". :rolleyes:
    Last edited by a moderator: Apr 23, 2017
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