Thermodynamics the work of French physicist Nicolas Léonard Sadi Carnot (1824) who believed that engine efficiency was the key that could help France win the Napoleonic Wars. Scots-Irish physicist Lord Kelvin was the first to formulate a concise definition of thermodynamics in 1854 which stated, "Thermo-dynamics is the subject of the relation of heat to forces acting between contiguous parts of bodies, and the relation of heat to electrical agency." The initial application of thermodynamics to mechanical heat engines was extended early on to the study of chemical compounds and chemical reactions. Chemical thermodynamics studies the nature of the role of
19th century in ichnology "giant" trackmaker was recognized by paleontologists Joseph Le Conte and Othniel Charles Marsh as a giant ground sloth, possibly of the genus "Mylodon". 1802 1820s Late 1820s 1828 1831 1834 1835 1836 1842 1843 1845 1846 1847 1848 1850 1851 1852 1854 1858 1860 1862 1864 1865 1877 1879 1880 1884 1886 1889 [[:Category:1890s in paleontology|1890s]] [[1894 in paleontology|1894]] [[1895 in paleontology|1895]] [[Category:19th century in paleontology]] [[Category:Ichnology]] [[Category:Paleontology timelines|Ichnology]] 19th century in ichnology The 19th century in ichnology refers to advances made between the years 1800 and 1899 in the scientific study of trace fossils, the preserved record of the