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Hii have a few questions about entropy:why does the definition

  1. Jul 21, 2012 #1
    hi

    i have a few questions about entropy:

    why does the definition of entropy stress the fact that the heat exchange by the system is reversible(dS=dQ_rev/T)?

    am i right, that processes are only reversible iff ΔS=0 and therefore e.g. isothermic, isobaric and isochoric processes even of ideal gases are irreversible in general?
     
  2. jcsd
  3. Jul 22, 2012 #2
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