In thermodynamics, a reversible process, or reversible cycle if the process is cyclic, is a process that can be "reversed" by means ofinfinitesimal changes in some property of the system without loss or dissipation of energy.^[1] Due to these infinitesimal changes, the system is at rest throughout the entire process. Since it would take an infinite amount of time for the process to finish, perfectly reversible processes are impossible. However, if the system undergoing the changes responds much faster than the applied change, the deviation from reversibility may be negligible. In a reversible cycle, the system and its surroundings will be exactly the same after each cycle.^[2]