What physical principle requires dividing change in heat by degrees Kelvin to reveal an invariance in an ideal heat engine?

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Marcin Noga

Robert Shour More generally I would say that it results from the Second law of thermodynamics.

Dudley J Benton

Are you talking about the Carnot cycle or Carnot efficiency (eff=(Th-Tc)/Th in °K), which is the upper limit for any heat engine and follows directly from the 2LoT? The graphical proof and derivation (two stacked rectangles) is straightforward.

Robert Shour

Dudley J Benton,

Thank you for your helpful reply. The question is referring to dQ1/T1=dQ2/T2.