Antione Laurent Lavoisier(1743-94), French Chemist and Physicist, a Founder of Modern Chemistry. He was one of the first to use effective quantitative methods in the study of chemical reactions. His classification of substances is the basis of the modern distinction between chemical elements and chemical compounds and of the system of chemical nomenclature. His work established the Law of Conservation of Mass(or Matter). He was guillotined during the Reign of Terror unleashed by French Revolution.
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