Carnot's Theorem:
Theorem-1:
It is impossible to construct a heat engine that operates between two thermal reservoirs and is more efficient than a reversible engine operating between the same two reservoirs.
Theorem-2:
All reversible heat engines operating between the same two thermal reservoirs have the same efficiency.
The two theorems can be proved by carrying out a thought experiment and with the help of second law of thermodynamic. Carnot's theorems can also be formed for refrigerators in a manner similar to heat engines.
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