Reflections on the Motive Power of Fire

Reflections on the Motive Power of Fire and on Machines Fitted to Develop that Power is a scientific treatise written by the French military engineer Sadi Carnot.^{[1][2][3][4][5]} Published in 1824 in French as Réflexions sur la puissance motrice du feu et sur les machines propres à développer cette puissance, the short book (118 pages in the original) sought to advance a rational theory of heat engines. At the time, heat engines had acquired great technological and economic importance, but very little was understood about them from the point of view of physics.

Title page of the 1824 French first edition.

Carnot's Reflections is now widely regarded as a key document in the development of modern thermodynamics, and Carnot himself (who published nothing else during his lifetime) has often been identified as the "father of thermodynamics". The book introduced such concepts as thermodynamic efficiency, reversible processes, the thermodynamic cycle, and Carnot's theorem.

Overview

The book is considered the founding work of thermodynamics.^[2]: viii It contains the preliminary outline of the second law of thermodynamics. Carnot stated that motive power is due to the fall of caloric (chute de calorique) from a hot to a cold body, which he analogized to the work done by a water wheel due to a waterfall (chute d'eau).^[6]

Despite the fact that the caloric theory of heat was incorrect, Carnot's work brought together three insights that remain relevant and were used by his successors to develop the concept of entropy:

• The "fall of heat" from a high temperature to a lower temperature is where the work comes from.
• Analyzing a cycle, rather than an open system, is the correct way to analyze a heat engine.
• The concept of a reversible process.

Similar to how the Reflections was the precursor to the second law, English physicist James Joule's 1843 paper Mechanical equivalent of heat was the precursor to the first law of thermodynamics. In his essay, Carnot also derived the result that later came to be known as the Clausius-Clapeyron relation.^[7]

Influence

Carnot's essay received very little attention during Carnot's lifetime. Carnot published nothing else and died in 1832, at the age of 36. However, in 1834 a French mining engineer, Émile Clapeyron, published a Memoir on the Motive Power of Heat that presented Carnot's analysis graphically.^[4]

The German physicist Rudolf Clausius learned of Carnot's work through Clapeyron's memoir. Clausius corrected Carnot's theory by replacing the conservation of caloric with the work-heat equivalence (i.e., energy conservation). Clausius also put the second law of thermodynamics into mathematical form by defining the concept of entropy. That work appeared in 1850 in Clausius's Mechanical Theory of Heat.^[8]

Another highly influential commentary on Carnot's essay was published in 1849 by William Thomson (the future Lord Kelvin), in a paper titled An Account of Carnot's Theory of the Motive Power of Heat. In that paper, Kelvin said of Carnot's derivation of what would later be called the "Clausius-Clapeyron equation" that "nothing in the whole range of Natural Philosophy is more remarkable than the establishment of general laws by such a process of reasoning."^[9]

Because of their respective commentary's on Carnot's essay, modern textbooks on thermodynamics usually introduce a "Clausius statement" and a "Kelvin statement" of the second law of thermodynamics. These statements appear to be different, but they can be shown to be logically equivalent, by an argument based on the Carnot cycle.

See also

• Timeline of thermodynamics

References

1. Carnot, Sadi (1824). Réflexions sur la puissance motrice du feu et sur les machines propres à développer cette puissance (in French). Paris: Bachelier.
2. Carnot, Sadi (1890). Thurston, Henry (ed.). Reflections on the Motive Power of Heat. Translated by Thurston, Henry. New York: J. Wiley & Sons. OL 14037447M. (full text of 1897 ed.) ( Full text of 1897 edition on Wikisource )
3. Carnot, Sadi (1899). "Reflections on the Motive Power of Heat and on Engines Suitable for Developing this Power". In Magie, William Francis (ed.). The Second Law of Thermodynamics: Memoirs by Carnot, Clausius, and Thomson. Translated by Magie, William Francis. Harper & Brothers. OL 7072574M.
4. Carnot, Sadi; Clapeyron, E.; Clausius, R. (1960). Mendoza, Eric (ed.). Reflections on the Motive Power of Fire – and other Papers on the Second Law of Thermodynamics. New York: Dover Publications. ISBN 978-0-486-44641-7.
5. Carnot, Sadi; Fox, Robert (1986), Reflections on the Motive Power of Fire: a Critical Edition with the Surviving Scientific Manuscripts, Manchester University Press; Lilian Barber Press, New York, ISBN 978-0-936508-16-0
6. La Mer, Victor K. (January 1954). "Some Current Misinterpretations of N. L. Sadi Carnot's Memoir and Cycle". American Journal of Physics. 22 (1): 20–27. Bibcode:1954AmJPh..22...20L. doi:10.1119/1.1933600. ISSN 0002-9505.
7. Feynman, Richard (1963). "Illustrations of Thermodynamics". The Feynman Lectures on Physics. California Institute of Technology. Retrieved 13 December 2023. This relationship was deduced by Carnot, but it is called the Clausius-Clapeyron equation.
8. Rudolf Clausius (1867). The Mechanical Theory of Heat – with its Applications to the Steam Engine and to Physical Properties of Bodies. London: John van Voorst, 1 Paternoster Row. MDCCCLXVII.
9. Thomson, William (1849). "An Account of Carnot's Theory of the Motive Power of Heat; with Numerical Results deduced from Regnault's Experiments on Steam". Transactions of the Edinburgh Royal Society. 16 (5): 541–574. doi:10.1017/S0080456800022481.

External links

• Reflections on the Motive Power of Fire (1824), analysed on BibNum (click "À télécharger" for English analysis)
• Kostic, M (2011). "Revisiting The Second Law of Energy Degradation and Entropy Generation: From Sadi Carnot's Ingenious Reasoning to Holistic Generalization". AIP Conf. Proc. AIP Conference Proceedings. 1411 (1): 327–350. Bibcode:2011AIPC.1411..327K. CiteSeerX 10.1.1.405.1945. doi:10.1063/1.3665247. American Institute of Physics, 2011. ISBN 978-0-7354-0985-9. Abstract at: . Full article (24 pages ), also at .