Irreversibility versus heat loss: judge the statement Statement: “There is a loss of heat in an irreversible process.” Choose whether the statement is correct or incorrect.

Concept/Approach

• Irreversibility is about entropy production due to finite gradients, friction, mixing, shocks, etc.
• Heat loss is neither necessary nor sufficient for irreversibility.

Illustration
Adiabatic throttling (Joule–Thomson) is irreversible with no heat transfer (Q = 0).Conversely, a reversible isothermal process transfers heat but can be reversible.

Final Answer
Disagree — irreversibility is about entropy generation, not necessarily about heat loss.