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,
Christianity in the 19th century Calvinist and Arminian are more frequently used, referring to the conclusion of the Synod of Dort. The 19th century saw the rise of Biblical criticism, new knowledge of religious diversity in other continents, and above all the growth of science. This led many Christians to emphasize the brotherhood, to seeing miracles as myths, and to emphasize a moral approach with religion as lifestyle rather than revealed truth. Liberal Christianity—sometimes called liberal theology—reshaped Protestantism. Liberal Christianity is an umbrella term covering diverse, philosophically informed movements and moods within 19th and 20th century Christianity. Despite its name, liberal Christianity has always been