Physical Chemistry Chapter 3 Carnot's Principle Carnot Principle: No heat engine can be more efficient than a reversible heat engine when both engines work between the same pair of temperatures The maximum amount of work from a given supply of heat is obtained with a reversible engine.5 Carnot’s Principle Carnot Principle: No heat engine can be more efficient than a reversible heat engine when both engine s work be twe en the s ame pa ir of temperatures. The maximum amount of work from a given supply of heat is obtained with a reversible engine. Physical Chemistry Chapter 3