Water electrolysis weighs hydrogen and oxygen, where is the oxygen

Water electrolysis weighs hydrogen and oxygen, where is the oxygen
1. Water is electrolyzed into about 33% hydrogen and 66% oxygen. If pure hydrogen is used by the machine for the ventilator, the oxygen is generally discharged from the machine through water circulation.
2. If the hydrogen respirator produces a mixture of hydrogen and oxygen for human breathing, it is hydrogen and oxygen mixing. At present, only a few hydrogen respirators on the market use this mode, and the hydrogen and oxygen atomizer in the United States is hydrogen and oxygen mixing.
3. The explosion limit of the mixture of hydrogen and air is: the explosion limit of hydrogen is 4.0%~75.6% (volume concentration), that is, if the volume concentration of hydrogen in the air is between 4.0%~75.6%, it will explode when it meets the fire source, and when the hydrogen concentration is less than 4.0% or more than 75.6%, it will not explode even when it meets the fire source.
4. So the pure hydrogen from the tube * * is discharged into the atmosphere. At this time, it can be ignited with a lighter, and the mixture of hydrogen and oxygen with spark may cause explosion.
5. The explosion is caused by intense combustion (or reaction) in a limited space.