Definitions for oxyhydrogenˌɒk sɪˈhaɪ drə dʒən
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of, or using a mixture of hydrogen and oxygen
Oxyhydrogen is a mixture of hydrogen and oxygen gases. This gaseous mixture is used for torches for the processing of refractory materials and was the first 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 required to avoid an oxidizing flame. This mixture may sometimes be called by an old term knallgas, although some authors used to define knallgas to be a generic term for the mixture of fuel with precise amount of oxygen required for complete combustion, thus 2:1 oxyhydrogen would be called "hydrogen-knallgas". Brown's gas and HHO are fringe science terms for a 2:1 mixture of oxyhydrogen allegedly endowed with special properties.
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