Reflections on the Motive Power of Fire and on Machines Fitted to Develop that Power is a book published in 1824 by
French physicist Sadi Carnot. The 118-page book's French title was
Réflexions sur la puissance motrice du feu et sur les machines propres à développer cette puissance. It is a significant publication in the
history of thermodynamics about a generalized theory of
heat engines.