Rudolf Clausius, German physicist

Rudolf Clausius, German physicist

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Rudolf Clausius (1822-1888), German theoretical physicist. Clausius was the first to propose the electrical dissociation of molecules in solution into ions, an idea not fully accepted until decades later. His fundamental contributions were in thermodynamics, especially the concept of entropy. He stated that within a closed system, the ratio of the heat content to the absolute temperature may increase, but will never decrease. The system may become more disordered, but never more ordered. This is now known as the second law of thermodynamics. Clausius was awarded the Royal Society's Copley Medal in 1879.

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Keywords: 1800s, 19th century, adult, black-and-white, caucasian, clausius-clapeyron relation, copley medal, energy, entropy, european, german, head and shoulders, historical, history, human, ionic theory, male, man, mathematical, mathematician, mathematics, monochrome, people, person, physical, physical chemistry, physicist, physics, portrait, rudolf clausius, rudolf julius emanuel clausius, scientist, second law of thermodynamics, theory of ions, thermodynamics

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