In thermodynamics, efficiency, symbol η (eta), is the ratio of work output to heat input of any heat engine: [1]

\eta = \frac{W_{out}}{Q_{in}}

The maximum theoretical efficiency that any heat engine can obtain is based on Carnot’s theorem.

1. Perrot, Pierre. (1998). A to Z of Thermodynamics. Oxford University Press.

External links
‚óŹ Thermal efficiency – Wikipedia.

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