Reversibility and Irreversibility in Thermostatics
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چکیده
First a general definition of reversibility is given which is in accordance with the mechanical concept of reversibility. This definition is applied to thermostatics. It is shown that the smooth curves in the space of equilibrium parameters can be approximated arbitrarily by irreversible or by almost reversible real processes. The work done during an almost reversible process is given by a Pfaffian form. The converse is also true. If the differential work is given by a Pfaffian form the processes are practically reversible. Finally the uniqueness of a Pfaffian form is shown, if it is used as differential work.
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