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Factitious airs was a term used for synthetic gases which emerged around 1670 when Robert Boyle coined the term upon isolating what is now understood to be hydrogen.[1] Factitious means "artificial, not natural",[2] so the term means "man-made gases".
- ^ Mattson, Bruce. "A Brief History of the Study of Gas Chemistry" (PDF). mattson.creighton.edu/.
- ^ "Factitious". dictionary.cambridge.org. Retrieved 23 March 2021.