Oxyhydrogen

Oxyhydrogen is a mixture of hydrogen (H₂) and oxygen (O₂) gases. This gaseous mixture is used for torches to process refractory materials and was the first^[1] gaseous mixture used for welding. Theoretically, a ratio of 2:1 hydrogen:oxygen is enough to achieve maximum efficiency; in practice a ratio 4:1 or 5:1 is needed to avoid an oxidizing flame.^[2]

This mixture may also be referred to as Knallgas (Scandinavian and German Knallgas; lit. 'bang-gas'), although some authors define knallgas to be a generic term for the mixture of fuel with the precise amount of oxygen required for complete combustion, thus 2:1 oxyhydrogen would be called "hydrogen-knallgas".^[3]

"Brown's gas" and HHO are terms for oxyhydrogen originating in pseudoscience, although x H₂ + y O₂ is preferred due to HHO meaning H₂O.

^ Howard Monroe Raymond (1916), "Oxy-Hydrogen Welding", Modern Shop Practice volume 1, American Technical Society, archived from the original on March 6, 2011
^ Viall, Ethan (1921). Gas Torch and Thermite Welding. McGraw-Hill. p. 10. Archived from the original on August 3, 2016.
^ W. Dittmar, "Exercises in quantitative chemical analysis", 1887, p. 189 Archived June 27, 2014, at the Wayback Machine

[1] Howard Monroe Raymond (1916), "Oxy-Hydrogen Welding", Modern Shop Practice volume 1, American Technical Society, archived from the original on March 6, 2011

[2] Viall, Ethan (1921). Gas Torch and Thermite Welding. McGraw-Hill. p. 10. Archived from the original on August 3, 2016.

[3] W. Dittmar, "Exercises in quantitative chemical analysis", 1887, p. 189 Archived June 27, 2014, at the Wayback Machine

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