The phlogiston theory has been disprooven for a long time.
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No, it was not. The phenomena explained by the theory are now
known to be a result of oxidation, and phlogiston does not
exist.
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The phlogiston theory was first proposed by Johann Joachim
Becher in 1667. This theory is now considered obsolete and was
replaced by the oxygen theory.
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There was no evidence until at least 2 yrs into the work of the
phlogiston theory