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,
Mormonism in the 19th century In its remote settlement, the church governed civil affairs and made public its practice of plural marriage (polygamy). As the federal government asserted greater control over Utah, relations with the Mormons enflamed, leading to the Utah War and the Mountain Meadows Massacre. Mormon polygamy became a major political issue, with federal legislation and judicial rulings curtailing Mormon legal protections and delegitimizing the church. Eventually, the church issued a manifesto discontinuing polygamy, which paved the way to Utah statehood and realignment with mainstream American society. Mormonism in the 19th century This is a chronology of Mormonism. In the late 1820s, founder