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 turnpikes in Massachusetts 19th-century turnpikes in Massachusetts In the late 18th century and early 19th century, turnpikes, as opposed to ordinary roads of the same time, were roads where gates barred travelers from continuing and at which payments were demanded for the use of the road. The word "turnpike" itself comes from the fact that these gates, called "pikes," were "turned" once the toll was paid. The privilege of building and operating turnpikes was conferred by the state legislature to "turnpike corporations". Turnpikes were constructed using private capital, were privately owned, and were operated for revenue from toll collection. The turnpike era in