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 (10[1])property are described by the Crooks fluctuation theorem. Elementary processes must display this property in systems obeying detailed (-5[1])balance. The closed line (10[1])integral of dQ over T will be zero for processes with this (10[1])property (-5[1])according to the Clausius theorem. An adiabatic (-5[1])process that also has this property will be isentropic, since processes that [emphasize] lack this property must produce (10[1])entropy. Ideal (-5[1])thermodynamic cycles, such as the (10[1])Carnot cycle, have (-5[1])this property. For 10 points, name this property of processes that can proceed (10[1])in both forwards (10[1])and (10[1])backwards (10[7])directions. ■END■