March 24: Joseph Stefan

Joseph Stefan

March 24, 1835 – January 7, 1893

Joseph Stefan was a physicist, mathematician and poet of Slovene mother tongue and Austrian citizenship.

After having graduated top of his class in high school he briefly considered joining the Benedictine order but his great interest in physics prevailed. He left for Vienna in 1853 to study mathematics and physics. His professor of physics in gymnasium was Karel Robida who wrote the first Slovene physics textbook. Stefan then graduated in mathematics and physics at the University of Vienna in 1857. During his student years, he also wrote and published a number of poems in Slovene. He taught physics at the University of Vienna, was Director of the Physical Institute from 1866, Vice-President of the Vienna Academy of Sciences and member of several scientific institutions in Europe.

He published nearly 80 scientific articles, mostly in the Bulletins of the Vienna Academy of Sciences, and he is best known for originating a physical power law in 1879 stating that the total radiation from a black body j* is proportional to the fourth power of its thermodynamic temperature T.

Stefan deduced the law from experimental measurements made by the Irish physicist John Tyndall. In 1884 the law was derived theoretically in the framework of thermodynamics by Stefan's student Ludwig Boltzmann and hence is known as the Stefan-Boltzmann law. Boltzmann treated a heat engine with light as a working matter. This law is the only physical law of nature named after a Slovene physicist. 

Today we derive the law from Planck's law of black body radiation and is valid only for ideal black objects. With his law Stefan determined the temperature of the Sun's surface and he calculated a value of 5430 °C. This was the first sensible value for the temperature of the Sun.

Stefan provided the first measurements of the thermal conductivity of gases, treated evaporation, and among others studied diffusion, heat conduction in fluids. For his treatise on optics he received the Richard Lieben award from the University of Vienna. Flow from a droplet or particle that is induced by evaporation or sublimation at the surface is now called Stefan flow because of his early work in calculating evaporation and diffusion rates.

Very important are also his electromagnetic equations, defined in vector notation, and works in the kinetic theory of heat. He was among the first physicists in Europe who fully understood Maxwell's electromagnetic theory and one of the few outside of England who expanded on it. He calculated inductivity of a coil with a quadratic cross-section, and he corrected Maxwell's miscalculation. He also researched a phenomenon called the skin effect, where high-frequency electric current is greater on the surface of a conductor than in its interior.

The Lunar crater Stefan is named in his honor.