Ludwig Boltzmann
Ludwig Eduard Boltzmann was an Austrian physicist and philosopher. His greatest achievements were the development of statistical mechanics, and the statistical explanation of the second law of thermodynamics. In 1877 he provided the current definition of entropy, , where Ω is the number of microstates whose energy equals the system's energy, interpreted as a measure of the statistical disorder of a system. Max Planck named the constant kB the Boltzmann constant.
20 February 1844
Born on the same birth date (20 February 1844): Joshua Slocum
Born on the same birth day (20 February): Ansel Adams • Daniella Pineda • Julio Borbón • Justin Verlander • Ryan Sweeney (baseball) • Tony Hibbert • Vincent Massey
Born in the same month (February 1844): Charles-Marie Widor • G. Stanley Hall • Joshua Slocum