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Finding the change in pressure and entropy of a quasistatic adiabatic process

  1. Sep 19, 2010 #1
    1. The problem statement, all variables and given/known data
    Suppose that one mole of an ideal gas expands in a quasi-static adiabatic process from P1 = 1 Pa and V1 = 1m3 to V2 = 8m3. What is the change in the pressure and the entropy of the gas?


    2. Relevant equations

    PV[tex]\gamma[/tex]=constant

    3. The attempt at a solution
    I can't come up with a second equation that doesn't introduce another unknown. I've been working on thermodynamics for the past two days almost non-stop and I'm drained. Any help would be nice. thanks.
     
  2. jcsd
  3. Sep 19, 2010 #2
    perhaps I am supposed to assume that the gas is monoatomic? My textbook is vague and its not clear to me whether all ideal gasses are considered monoatomic.

    this is what i found:

    [tex]\gamma[/tex]= 5/3 (ideal monatomic gas).
     
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