NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY
Antoine Lavoisier (1743-1794), French chemist in his lab. Lavoisier (second from right) is considered to be the founder of modern chemistry. He was instrumental in the use of accurate measurement for the study of material compositions, oxidation and other combustion reactions. He showed that air was composed of oxygen and nitrogen.
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