In thermodynamics, a process is called reversible when

Options

A. Surroundings and system change into each other
B. There is no boundary between system and surroundings
C. The surroundings are always in equilibrium with the system
D. The system changes into the surroundings spontaneously

Answer

A, C

Explanation

Thermodynamics is a reversible process in which surroundings are always in equilibrium with system.