Svante Arrhenius, Swedish chemist

Svante Arrhenius, Swedish chemist

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

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Caption: Svante August Arrhenius (1859-1927), Swedish chemist. Arrhenius studied chemistry and physics at Uppsala University. In 1883 he proposed that substances were partly converted to an active form when dissolved, leading to conductivity. The merit of this doctoral research went unrecognised, but Arrhenius developed it into a theory of ions for which he was awarded the 1903 Nobel Prize in Chemistry. He also explained the effect of temperature on reaction rates, and the equation describing this is now called the Arrhenius equation. He was one of the first scientists to write about the greenhouse effect. Photographed circa 1907.

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