for an isothermal process.Recall the deﬁnition of Helmholtz free energy–the energy of the system availableto do work.We learned previously that the maximum amount of work one can extractfromthe systemis the work done during a reversible process. HencedA=dwrev.For now let us limit the discussion to reversible processes. ThendS=1T(dU−dwrev)=1T(dqrev+dw/rev−dw/rev)(18.4)=dqrevT.(Reversible process)Note: An alternative approach to thermodynamics which makes no reference to
This is the end of the preview.
access the rest of the document.