GARY BROWN / SCIENCE PHOTO LIBRARY GARY BROWN / SCIENCE PHOTO LIBRARY
Caricature of the Austrian physicist Ludwig Boltzmann (1844- 1906). Boltzmann extended the kinetic theory of gases and used the mechanics and statistics of large numbers of particles to give definitions of heat and entropy (a measure of the disorder of a system). He also worked on electromagnetism and black body radiation. Boltzmann suffered life-long depression and he committed suicide at age 62.
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