Meaning of thermal equilibrium for flowing steam Interpret the term 'thermal equilibrium' in the context of the flow state of steam in a process description. Choose the most appropriate characterization.

Concept/Approach

• Thermal equilibrium means no temperature gradients within the system; the temperature is uniform and does not change with time or position, which corresponds to an isothermal description.
• Isentropic additionally requires reversibility (no entropy change), which is stronger than thermal equilibrium alone.

Final AnswerIsothermal