Pierre Maurice Marie Duhem (French: [pjɛʁ mɔʁis maʁi dy.ɛm, moʁ-] ; 9 June 1861 – 14 September 1916) was a French theoretical physicist who made significant contributions to thermodynamics, hydrodynamics, and the theory of elasticity. Duhem was also a prolific historian of science, noted especially for his pioneering work on the European Middle Ages. As a philosopher of science, Duhem is credited with the "Duhem–Quine thesis" on the indeterminacy of experimental criteria. Duhem's opposition to positivism was partly informed by his traditionalist Catholicism, an outlook that put him at odds with the dominant academic currents in France during his lifetime.
Early life and education Pierre Duhem was born in Paris on 10 June 1861. He was the son of Pierre-Joseph Duhem, who was of Flemish origins, and Marie Alexandrine née Fabre, whose family hailed from Languedoc. Pierre-Joseph worked as a sales representative in the textile industry and the family lived in a modest neighborhood on the Rue des Jeûneurs, just south of Monmartre. The family was devoutly Catholic and its conservative outlook was influenced by having lived through the Paris Commune of 1871, which the Duhems saw as a manifestation of the anarchy that must follow from the rejection of religion. The young Pierre completed his secondary studies at the Collège Stanislas, where his interest in the physical sciences was encouraged by his teacher Jules Moutier, who was a theoretical physicist and the author of influential textbooks on thermodynamics. Pierre was admitted as the first-ranked of his cohort at the prestigious École normale supérieure (ENS) in 1882. At the ENS, he completed licentiates in mathematics and physics in 1884. He then earned his agrégation in physical sciences in 1885. Duhem prepared a doctoral thesis on the use of the thermodynamic potential in the theory of electrochemical cells. In his thesis, Duhem explicitly attacked the "principle of maximum work" as framed by Marcellin Berthelot. The jury rejected that thesis and Duhem's academic career appears to have been hampered ever after by his differences with Barthelot. In addition to their scientific disagreements, Duhem was a conservative Catholic and royalist, whereas the politically powerful Barthelot was an anti-clerical republican. In 1888 Duhem finally received his doctorate with a new thesis on the theory of magnetization dynamics. Despite his accomplishments as a theoretical physicist, and later as a historian and philosopher of science, Duhem never obtained the academic position in Paris that he sought. He found work first at the University of Lille (1887–1893), then briefly at the University of Rennes (1893–1894), and finally as a professor of theoretical physics at the University of Bordeaux, where he was based for the rest of his career.
Theoretical physics Among scientists, Duhem is best known today for his work on chemical thermodynamics, and in particular for the Gibbs–Duhem and Duhem–Margules equations. His approach was strongly influenced by the early works of Josiah Willard Gibbs, which Duhem effectively explained and promoted among French scientists. In continuum mechanics, he is also remembered for his contribution to what is now called the Clausius–Duhem inequality. Duhem was a supporter of energetics and was convinced that all physical phenomena, including mechanics, electromagnetism, and chemistry, could be derived from the principles of thermodynamics. Influenced by William Rankine's "Outlines of the Science of Energetics", Duhem carried out this intellectual project in his Traité de l'Énergétique (1911), but was ultimately unable to reduce electromagnetic phenomena to thermodynamic first principles. Duhem shared Ernst Mach's skepticism about the physical reality and usefulness of the concept of atoms. He therefore did not follow the statistical mechanics of James Clerk Maxwell, Ludwig Boltzmann, and Gibbs, who explained the laws of thermodynamics in terms of the statistical properties of mechanical systems composed of many atoms. Duhem was an opponent of Albert Einstein's theory of relativity. In 1914, Duhem commented that Einstein's relativity theory "has turned physics into a real chaos where logic loses its way and common-sense runs away frightened". In his 1915 book La Science Allemande, he argued strongly against relativity. Duhem stated that the theory of relativity "overthrow[s] all the doctrines in which one has spoken of space, of time, of movement, all the theories of mechanics and of physics".
History of science
Duhem is well known for his work on the history of science, which resulted in the ten volume Le système du monde: histoire des doctrines cosmologiques de Platon à Copernic (The System of World: A History of Cosmological Doctrines from Plato to Copernicus). As a traditionalist Catholic, Duhem rejected the Enlightened conception of the European Middle Ages as intellectually barren. Instead, he endeavored to show that the Medieval Church had helped to foster the growth of Western science. Duhem's work as a historian of medieval science began with his research on the origins of statics, in the course of which he encountered the works of medieval mathematicians and philosophers such as John Buridan, Nicole Oresme, and Roger Bacon. Duhem came to see in them the true founders of modern science, who in his view had anticipated many of the discoveries of Galileo Galilei and later early modern scientists. Duhem claimed that "the mechanics and physics of which modern times are justifiably proud" had proceeded, "by an uninterrupted series of scarcely perceptible improvements, from doctrines professed in the heart of the medieval schools." Duhem helped to reintroduce the concept of "saving the phenomena" into the modern philosophy of science. In addition to the debates of the Copernican Revolution on "saving the phenomena" (σῴζειν τὰ φαινόμενα, sozein ta phainomena, contrasted with providing a physical explanation) Duhem was motivated by the thinking of Thomas Aquinas, who wrote concerning the epicycles and eccentrics of classical astronomy that
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