Air consists of 78% nitrogen and 21% oxygen, which liquefies at -183℃ and solidifies at - 218.9℃.

At atmospheric pressure, liquid oxygen only takes up 1/854 of its gaseous volume. This allows large quantities of oxygen to be transported and stored in cryogenic, liquid form.

The most important property of oxygen is its reactivity. There are only few elements with which oxygen will not react. Oxidation and combustion processes with oxygen-enriched atmospheres take place much faster than in air atmosphere. This property makes oxygen indispensable for a large number of industrial applications.

Because oxygen is also required for the metabolism of many organisms and is highly soluble in water, it is suitable for numerous applications involving water conditioning and environmental technology.