Rudolf KohlrauschRudolf Hermann Arndt Kohlrausch was a German physicist.BiographyHe was a native of Göttingen, the son of the Royal Hanovarian director general of schools Friedrich Kohlrausch. He was a high-school teacher of mathematics and physics successively at Lüneburg, Rinteln, Kassel and Marburg. In 1853 he became an associate professor at the University of Marburg, and four years later, a full professor of physics at the University of Erlangen.ResearchIn 1854 Kohlrausch introduced the relaxation phenomena, and used the stretched exponential function to explain relaxation effects of a discharging Leyden jar. In an 1855 experiment with Wilhelm Weber, he demonstrated that the ratio of electrostatic to electromagnetic units produced a number similar to the value of the speed of light, a constant which they named. Kirchhoff recognized that the ratio is equal to the speed of light. This finding was instrumental towards Maxwell's conjecture that light is an electromagnetic wave.FamilyHe was the father of physicist Friedrich Kohlrausch.Published worksElektrodynamische Maaßbestimmungen : insbesondere Zurückführung der Stromintensitäts-Messungen auf mechanisches Maass 1857. "Electrodynamic Measurements, Especially Attributing Mechanical Units to Measures of Current Intensity". .