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Homework Help: Thermodynamics - Whcih isotherm has higher temperature?

  1. May 11, 2006 #1
    Two isotherms are given. How do we identify which one is at higher temperature? The area of the rectangle formed with P & V as sides seems to equal for both the curves. So I think the temperatures are equal. But the answer given in my book is T1<T2.
    I am herewith attaching the P-V diagram.

    Attached Files:

  2. jcsd
  3. May 11, 2006 #2

    Chi Meson

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    I can't see the attachment yet, but the temperature is greater on an ideal gas PV diagram at the locations where the product of P*V is greater. This means that as go up-and-right on the PV diagram, you will increase in temperature.
  4. May 11, 2006 #3

    Andrew Mason

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    I can't see your diagram yet but note: the area of the rectangle of sides P and V measures (PV =) nRT. If n differs between the two gases, the PV area might be the same but the temperatures are not.

  5. May 12, 2006 #4
    I dont have words to thank you. This is a service to all students like me.
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