A gaseous mixture of oxygen and hydrogen, or historically, a mixture of air and hydrogen gas, potentially explosive.
From 'air' (oxygen) + 'hydrogen,' combining the two gas elements. The term is largely obsolete, used mainly in historical scientific literature from the 19th century.
Airohydrogen was genuinely dangerous—this mixture is extremely explosive, and scientists who worked with it in early hydrogen research had to be incredibly careful; it's one reason the Hindenburg disaster was so catastrophic.
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