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( Nicolas Clément)
Nicolas Clément (1779, Dijon - 1842) was a French physicist and chemist. He was a colleague of Charles Desormes, with whom he conducted the Clément-Desormes experiment[[1]]. The two chemists are also credited with determining an accurate value of gamma in the gas law that relates the heat capacity of air when expanded at constant pressure vs. constant temperature. They also conducted research on iodine and played a role in determining that it was an element. This research eventually led others to invent the process of photography, and Clément-Desormes is recognized as a contributor in the early history of that industry. Among their accomplishments was establishing a value for absolute zero. Clément married Desormes' daughter and adopted the family surname as Clément-Desormes. Clément himself spelled his first name Nicolas, not Nicholas. Professor Clément held one of the first chairs in chemistry at the Conservatoire des Arts et Metiers in Paris. He taught a course in industrial chemistry that emphasized the thermodynamics of steam in relation to powering steam engines. In about 1819, he befriended Sadi Carnot[[2]], and the two men developed methods for calculating the maximum amount of energy that could be obtained from a kg of coal. Clément and Carnot clearly understood the concept of a mechanical equivalent of heat, and developed formulae for calculating energy efficiency almost 20 years before Mayer [[3]] and Joule's [[4]] work on this subject in the 1840's[[5]]. Evidence concerning the connection between Clément and Carnot is summarized in a book by the historian, Robert Fox, "Reflexions on the Motive Power of Fire, A Critical Edition..." - 1986 - Manchester University Press. Clément-Desormes was a successful industrialist who was owner or partner in several chemical companies, including one that made sugar from beets. He was sought after as an industrial consultant. Some speculate that his sudden death was brought on by a business disgreement concerning payments that were owed to him for successful introduction of a profitable process.
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