According to the second law of thermodynamics, the maximum efficiency of a heat engine operating between two temperatures is given by:

$\overline{){\mathbf{M}}{\mathbf{a}}{\mathbf{x}}{\mathbf{i}}{\mathbf{m}}{\mathbf{u}}{\mathbf{m}}{\mathbf{}}{\mathbf{E}}{\mathbf{f}}{\mathbf{f}}{\mathbf{i}}{\mathbf{c}}{\mathbf{i}}{\mathbf{c}}{\mathbf{n}}{\mathbf{e}}{\mathbf{c}}{\mathbf{y}}{\mathbf{=}}{\mathbf{1}}{\mathbf{-}}{\mathbf{\left(}}\frac{{\mathbf{T}}_{\mathbf{C}}}{{\mathbf{T}}_{\mathbf{H}}}{\mathbf{\right)}}}$

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