Applications: Oxygen has enormous applications in human industries, such as:
Medical uses. Oxygen is used as a breathing gas in the life support of surgical patients and as therapy (oxygen therapy) for patients with heart and lung conditions, etc.
Life support. In space missions, submarines and similar, low pressure gaseous oxygen is used as a breathing gas, to sustain the habitability levels of suits, ships and cabins.
Industrial uses. for the production of iron alloys such as steel. In the chemical industry, for the manufacture of numerous textile materials and plastics. Finally, oxygen is also used to burn acetylene and to make torches capable of cutting metal very quickly.
Fuels and purifiers. Oxygen is also used to oxidize rocket fuel, for waste water treatment or, as ozone (O3) for water purifiers.