Carnot's theorem or Carnot's principle may refer to:
In geometry:
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Carnot's theorem (inradius, circumradius), describing a property of the incircle and the circumcircle of a triangle
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Carnot's theorem (conics), describing a relation between triangles and conic sections
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Carnot's theorem (perpendiculars), describing a property of certain perpendiculars on triangle sides
In physics:
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Carnot's theorem (thermodynamics), setting a maximum efficiency obtainable from a heat engine
See also
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Carnot cycle
A Carnot cycle is an ideal thermodynamic cycle proposed by French physicist Sadi Carnot in 1824 and expanded upon by others in the 1830s and 1840s. By Carnot's theorem, it provides an upper limit on the efficiency of any classical thermodynam ...
, in thermodynamics
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