19th century in science Carnot captured some of the ideas of thermodynamics in his discussion of the efficiency of an idealized engine. Sadi Carnot's work provided a basis for the formulation of the first law of thermodynamics—a restatement of the law of conservation of energy—which was stated around 1850 by William Thomson, later known as Lord Kelvin, and Rudolf Clausius. Lord Kelvin, who had extended the concept of absolute zero from gases to all substances in 1848, drew upon the engineering theory of Lazare Carnot, Sadi Carnot, and Émile Clapeyron–as well as the experimentation of James Prescott Joule on the interchangeability of mechanical, chemical,
19th century in literature 19th century in literature Literature of the 19th century refers to world literature produced during the 19th century. The range of years is, for the purpose of this article, literature written from (roughly) 1799 to 1900. Many of the developments in literature in this period parallel changes in the visual arts and other aspects of 19th-century culture. Literary realism is the trend, beginning with mid nineteenth-century French literature and extending to late-nineteenth- and early-twentieth-century authors, toward depictions of contemporary life and society as it was, or is. In the spirit of general "realism," realist authors opted for depictions of everyday