##  [Carnot's Theorem](/carnots-theorem) 

  ##  [Carnot's Theorem](https://engineering.quantumdictionary.io/carnots-theorem-0) 

  

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**Engineering & Applied Technologies Dictionary**

 







 

 

 

 



 

 

 

 

Definition

No heat engine operating between two fixed thermal reservoirs can be more efficient than a reversible (Carnot) engine operating between the same reservoirs; the maximum efficiency depends only on the absolute temperatures of the hot and cold reservoirs.