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search Nineteenth century electrolytic cell for producing
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
(German; "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[4] and HHO are fringe science terms for a 2:1 mixture of
oxyhydrogen; its proponents claim that it has special
properties.   Oxyhydrogen will combust when brought to its
autoignition temperature. For the stoichiometric mixture, 2:1
hydrogen:ox