Nicolas Léonard Sadi Carnot

Lore & Background

Sadi Carnot was born in Paris at the Petit Luxembourg palace, where his father Lazare Carnot served as a member of the Directory. His father named him after the 13th-century Persian poet Sadi of Shiraz. Carnot studied at the École polytechnique, where his classmates included Michel Chasles and his professors included André-Marie Ampère and Siméon Denis Poisson. He later trained at the École d'application de l'artillerie et du génie in Metz and became an officer in the French army's corps of engineers.

Reader's Guide

That commentary drew the attention of William Thomson (later Lord Kelvin) and Rudolf Clausius. Thomson used Carnot's analysis to develop an absolute thermodynamic temperature scale, while Clausius used it to define the concept of entropy, formalizing the second law of thermodynamics. Carnot died in relative obscurity at age 36, but today he is often characterized as the 'father of thermodynamics'. His work remains central to understanding the limits of heat engine performance and the foundations of thermodynamics.

Did You Know?

• He was the son of Lazare Carnot, an eminent mathematician and commander of the French Revolutionary Army.
• Carnot died of cholera in a private sanatorium run by psychiatrist Jean-Étienne Esquirol.