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 Barbary pirates and succeeded in stopping their enslavement of Europeans. The UK's Slavery Abolition Act charged the British Royal Navy with ending the global slave trade. The first colonial empire in the century to abolish slavery was the British, who did so in 1834. America's 13th Amendment following their Civil War abolished slavery there in 1865, and in Brazil slavery was abolished in 1888 (see Abolitionism). Similarly, serfdom was abolished in Russia. The 19th century was remarkable in the widespread formation of new settlement foundations which were particularly prevalent across North America and Australia, with a significant proportion of the