Question

A process is called reversible when:

• A. surrounding and system change are same.
• B. there is no boundary between system and surrounding
• C. surrounding is always in equilibrium with system
• D. system change into surroundings spontaneously.

Answer 1

Answer: (C)

surrounding is always in equilibrium with system

In thermodynamics, a reversible process is a process whose direction can be reversed by inducing infinitesimal changes to some properties of the system via its surroundings. Throughout the entire reversible process, the system is in thermodynamics equilibrium with its surroundings.