Often referred to as HHO or oxyhydrogen gas (Brown´s Gas, HHO gas, fire damp, detonating gas) – constitutes 2 parts of hydrogen gas, and one part of oxygen in a certain volume.
Conventional oxygen and hydrogen are sold commercially or obtained with conventional electrolysers are supplied as O2 and H2. That is, the molecules of both gases have two atoms. This is a more stable state of these gases than when individual atoms are separated (charged ions) and each atom exists separately.
The problem with H2 and O2 as flammable gases is that before they react to convert to H2O, they have to be decomposed into H and O atoms. The energy required for this process is the most part of the energy that you get from their interaction to obtain H2O.
What makes Brown’s gas unique, and the most valuable one, is that it does not exist in the molecular form of H2 and O2 molecules. Here they are in a monatomic state (one atom per molecule). In this state, when the hydrogen burns out (reacts with oxygen), 3.8 times more energy will be returned.