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Antoine Laurent Lavoisier The Law of Conservation of Mass (or Matter) in a chemical reaction can be stated thus: In a chemical reaction, matter is neither created nor destroyed. It was discovered by  Antoine Laurent Lavoisier (1743-94) about 1785. However, philosophical speculation and even some quantitative experimentation preceeded him.
French scientist and aristocrat Antoine Lavoisier developed the Law of Conservation of Mass. Lavoisier is considered by many to be the father of chemistry bringing an end to the study of alchemy. This video clip from the BBC: Einsteinâs Big Idea explains Lavoisierâs experiments!