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Information on Carnot efficiency can be found at Wikipedia. What's this?

The Carnot cycle, consists of two isothermal processes and two adiabatic processes. The second law of thermodynamics states that not all supplied heat in a heat engine can be used to do work. The Carnot efficiency limits the fraction of heat that can be used. The Carnot efficiency can be expressed as,

   μC = (Ti - To) / Ti (1)

   μC = efficiency of the Carnot cycle

   Ti = temperature at the engine inlet (K)

   To = temperature at engine exhaust (K)

The less friction heat given off the more efficient the machine is.