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
Italian Neoclassical and 19th-century art much of their work in these wild areas. This sense of the name also identified the artists with outlaws, reflecting the traditionalists' view that new school of artists was working outside the rules of art, according to the strict laws defining artistic expression at the time. In its early years the new movement was ridiculed. Many of its artists died in penury, only achieving fame towards the end of the 19th century. Today the work of the Macchiaioli is much better known in Italy than elsewhere; much of the work is held, outside the public record, in private collections there.