5 июн 1781 г. - Antoine de Lavoisier (late 1700s)

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Antoine de Lavoisier was a French nobleman and chemist who was famous for defining the term “element” as a pure substance that cannot be chemically broken down into simpler substances, identified 23 elements and recognized mixtures exist and identified air as a
mixture of oxygen and some other gas. (Air is at least two gases: one that does not burn and one that does).He. based his investigations on careful measurement and observations from other experiments.

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