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Entropy in isothermal expansion

  1. Nov 8, 2014 #1
    Air:
    V1= 0,1 m3
    P1= 1 MPa
    T1= 20 C
    After isothermal expansion P2= 0,1 MPa

    I had to find T2, M, V2, L, Q and found all those (T2=20 C; M=1,1927 kg; V2=1 m3; L=Q=230258 J) but need s (enthropy) for creating illustration in T-s
    I can`t find how it`s possible to calculate s1 and s2, is it possible at all or is it possible to find only delta s?
     
  2. jcsd
  3. Nov 9, 2014 #2
    I already found the solution. :) qRqUVr.jpg
    S2 with same formula, just had to change P with P2 (if finding S1, then P=P1), Cp was 1000, P0 is normal pressure (760 mm HG), T0 is normal temperature (273,15 K)
     
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