Question

The second law of thermodynamics is concerned with the:

• A. non-cyclic processes only
• B. direction of energy transfer
• C. amount of energy transferred
• D. irreversible processes only

Answer 1

The correct option is B direction of energy transfer

The second law of thermodynamics states that the total entropy of an isolated system can only increase over time. It can remain constant in ideal cases where the system is in a steady state (equilibrium) or undergoing a reversible process.

The second law of thermodynamics says that when energy changes from one form to another form, or matter moves freely, entropy (disorder) increases. Hence, it is concerned with the direction of flow of energy.