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,
Politics in 19th-century Hungary Politics in 19th-century Hungary Politics in 19th-century Hungary substantially driven by the "Ideology of '47, '48, '49 and '67", which refer to a set of different normative beliefs that were prevalent in the country in the second half of the 19th century. The political spectrum and the society changed dramatically during that time, especially through decisive events such as the Hungarian Revolution of 1848 or the Ausgleich in 1867. Many scholars have argued that this had a transformative effect not only on the legal and governmental systems of the time, but also on the legal claims of different social groups