Factitious airs

Factitious airs (also factitious air or artificial airs) was a term used in 17th- to early 19th-century pneumatic chemistry for any gas, then called an "elastic fluid", that could be artificially produced from solid or liquid bodies by chemical reaction, fermentation, putrefaction, distillation, dissolution, or heat.

The phrase was coined by Robert Boyle around 1670 while isolating what is now recognized as hydrogen (which he termed "inflammable air").

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