A pot is half-filled with water, and a lid is placed on it, forming a tight seal so that no water vapor can escape. The pot is heated on a stove, forming water vapor inside the pot. The heat is then turned off and the water vapor condenses back to liquid. Is this cycle reversible or irreversible? Why?
Solution 1DQ This cycle will be reversible only if the temperature change is kept very small with time during the heating and cooling process. The system must be very near to maintaining a thermal equilibrium within itself and with its surrounding. Under such a condition, the cycle can be reversed at any stage by warming up or cooling down. Otherwise, if temperature change is significantly large with time, it will be an irreversible process.