Source: wikibot/paul-ehrenfest
= Paul Ehrenfest
{wiki=Paul_Ehrenfest}
Paul Ehrenfest was an Austrian physicist born on January 18, 1880, and he passed away on September 2, 1933. He is known primarily for his contributions to statistical mechanics, thermodynamics, and the foundations of quantum theory. Ehrenfest developed important concepts in these fields, including the Ehrenfest theorem, which relates the time evolution of quantum mechanical observables to classical mechanics.