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Re: [Phys-l] T dS versus dQ

Jack Uretsy asked:
But why the emphasis on reversible processes when most interesting processes in real life are irreversible?

Simply because if you want to follow a process from an initial to a final state in order to calculate the overall change in some function of state variables, you must follow a process during which the state variables are well defined, ie.; a succession of well defined equilibrium states, ie.; a reversible, quasistatic process.

Bob Sciamanda
Physics, Edinboro Univ of PA (Em)