Why is entropy of reversible process always zero?

Entropy remains constant in a reversible process because energy is not “degraded.” It is stored as potential energy in a form that can do enough work to restore the system plus surroundings to their initial conditions. The entropy is merely transferred from system to surroundings.

When the cyclic process is reversible then the entropy will?

In the case of a reversible cycle, the change in entropy of the surroundings is zero. But, for an irreversible cycle, any entropy that is generated within the system during the cycle is transferred to the surroundings.

How does entropy changes in reversible process and irreversible process?

In a reversible process, the entropy change of the system and surroundings are equal and opposite. In an irreversible process, we generate extra entropy. We can assign that “extra” irreversible entropy either to the system or to the surroundings.

Why is entropy always increasing?

Even though living things are highly ordered and maintain a state of low entropy, the entropy of the universe in total is constantly increasing due to the loss of usable energy with each energy transfer that occurs.

What is the change in entropy of surroundings during reversible cycle?

In the case of a reversible cycle, the change in entropy of the surroundings is zero. But, for an irreversible cycle, any entropy that is generated within the system during the cycle is transferred to the surroundings. So, in this case, the entropy of the surroundings increases, but the entropy change of the system is still zero.

What is the difference between a reversible and an irreversible cycle?

In the case of a reversible cycle, the change in entropy of the surroundings is zero. But, for an irreversible cycle, any entropy that is generated within the system during the cycle is transferred to the surroundings.

Is entropy produced in irreversible processes?

Entropy is produced in irreversible processes. All real processes (with the possible exception of superconducting current flows) are in some measure irreversible, though many processes can be analyzed quite adequately by assuming that they are reversible.

What is the net change in entropy of universe?

For reversible processes (the most efficient processes possible), the net change in entropy in the universe (system + surroundings) is zero. Phenomena that introduce irreversibility and inefficiency are: friction, heat transfer across finite temperature differences, free expansion.