# Comment on : "Sadi Carnot on Carnot's theorem".

2 ARITH - Arithmétique informatique
LIRMM - Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier
Abstract : Carnot established in 1824 that the efficiency $\eta_{C}$ of reversible engines operating between a hot bath at absolute temperature $T_{hot}$ and a cold bath at temperature $T_{cold}$ is equal to $1-T_{cold}/T_{hot}$. Carnot particularly considered air as a working fluid and small bath-temperature differences. Plugging into Carnot's expression modern experimental values, exact agreement with modern Thermodynamics is found. However, in a recently published paper ["SadiCarnot on Carnot's theorem", \textit{Am. J. Phys.} \textbf{70}(1), 42-47, 2002], Güémez and others consider a "modified cycle" involving two isobars that they mistakenly attribute to Carnot. They calculate an efficiency considerably lower than $\eta_{C}$ and suggest that Carnot made compensating errors. Our contention is that the Carnottheory is, to the contrary, perfectly accurate.
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https://hal.archives-ouvertes.fr/hal-00000513
Contributor : Laurent Chusseau <>
Submitted on : Tuesday, July 22, 2003 - 10:28:59 AM
Last modification on : Tuesday, June 4, 2019 - 11:14:16 AM
Long-term archiving on : Monday, March 29, 2010 - 4:41:35 PM

### Citation

Jacques Arnaud, Laurent Chusseau, Fabrice Philippe. Comment on : "Sadi Carnot on Carnot's theorem".. 2003. ⟨hal-00000513⟩

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