22 дек 1769 г. - Joseph Priestly ( Late 1700's)
Описание:
Joseph Priestly was the very first person to isolate oxygen scientifically. Priestly performed an experiment that showed that plants produce oxygen. He put a mint plant in a closed container with a burning candle. The candle flame used up the oxygen and went out. He did not know that oxygen was an element throughout this process. His theory was correct.
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