A link between systems that [emphasize] lack this property microscopically and macroscopically was elucidated in a 1977 paper by Ilya Prigogine (“pre-GO-zheen”). Systems that are Markovian, stochastic, and have one form of this property are described by the Crooks fluctuation theorem. Elementary processes must display this property in systems obeying detailed balance. The closed line integral of dQ over T will be zero for processes with this (10[1])property according to the Clausius theorem. An adiabatic process that also has this property will be isentropic, since processes that [emphasize] lack this property must produce entropy. Ideal thermodynamic cycles, such as the Carnot cycle, have this property. For 10 points, name this property of processes that can proceed in both forwards and backwards directions. ■END■