Thermodynamics the work of French physicist Nicolas Léonard Sadi Carnot (1824) who believed that engine efficiency was the key that could help France win the Napoleonic Wars. Scots-Irish physicist Lord Kelvin was the first to formulate a concise definition of thermodynamics in 1854 which stated, "Thermo-dynamics is the subject of the relation of heat to forces acting between contiguous parts of bodies, and the relation of heat to electrical agency." The initial application of thermodynamics to mechanical heat engines was extended early on to the study of chemical compounds and chemical reactions. Chemical thermodynamics studies the nature of the role of
19th-century French art 19th-century French art 19th-century French art was made in France or by French citizens during the following political regimes: Napoleon Bonaparte's Consulate (1799-1804) and Empire (1804-1814), the Restoration under Louis XVIII and Charles X (1814-1830), the July Monarchy under Louis Philippe d'Orléans (1830-1848), the Second Republic (1848-1852), the Second Empire under Napoleon III (1852-1871), and the first decades of the Third Republic (1871-1940). Many of the developments in French arts in this period parallel changes in literature. For more on this, see French literature of the 19th century. For more on French history, see History of France. The French Revolution