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Calculating change in entropy with °C or K.

  1. Oct 12, 2016 #1
    1. The problem statement, all variables and given/known data
    I was given a graph in the PV plane of a cyclic process and asked to find some quantities, one of them is the change in entropy for the system. I just had a question about the units.

    2. Relevant equations
    dS = CVln(Tf/Ti)
    3. The attempt at a solution
    The data was given in Celsius, should I convert to kelvin when I put it into this equation?
     
  2. jcsd
  3. Oct 13, 2016 #2

    haruspex

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    Absolutely.:wink:
     
  4. Oct 13, 2016 #3

    DrClaude

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    Staff: Mentor

    The only time you can use °C is when you calculate a ΔT.
     
  5. Oct 13, 2016 #4
    Thank you everyone.
     
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