What experiments led Claude-Louis Berthollet to accept Lavoisier’s oxygen theory?

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Claude-Louis Berthollet initially supported the phlogiston theory, which was the prevailing chemical framework of his time. However, his transition to supporting Antoine-Laurent Lavoisier’s oxygen-based theory was driven by his own research in pneumatic chemistry.

Through these experimental studies, Berthollet found evidence that contradicted the phlogiston model and aligned with Lavoisier’s explanations regarding the role of oxygen. By 1785, this shift in understanding led him to join Lavoisier and other colleagues in advancing a new chemical revolution, which included the fundamental reorganization of chemical nomenclature.1