An equation that describes the molar conductivities of strong electrolytes at low concentration, i.e. Λ‎_m = Λ‎⁰_m – Κc^½‎, where Λ‎_m is the molar conductivity, Λ‎⁰_m is the limiting molar conductivity (the molar conductivity in the limit of zero concentration when the ions do not interact with each other), Κ‎ is a coefficient related to the stoichiometry of the electrolyte, and c is the concentration of the electrolyte. It is possible to express Λ‎⁰_m as a sum of the contribution of each of its ions. The Kohlrausch equation was first stated in about 1900 by the German chemist Friedrich Kohlrausch (1840–1910) as the result of a considerable amount of experimental work. With its characteristic c^½‎ dependence, the equation is explained quantitatively by the existence of an ionic atmosphere round the ion as analysed by the Debye–Hückel–Onsager theory.