A succession of events which bring the system back to its initial condition is called _.

Explanation

In the context of thermodynamics, physics, and engineering, a "cycle" refers to a series of processes or events that brings a system back to its initial state. In a thermodynamic cycle, a system undergoes a sequence of operations or transformations that ultimately returns it to its original condition, completing a closed loop. Cycles are fundamental to the analysis and understanding of various systems, such as heat engines, refrigeration systems, and other mechanical devices, where energy undergoes a series of transformations and the system returns to its starting point.