Its major use is in steel production, for example in the Bessemer process. The oxyacetylene torch is another important industrial application. Oxygen is utilized in medicine in the treatment of respiratory diseases and is mixed with other gases for respiration in submarines, high-flying aircraft, and spacecraft.
Oxygen: without this we can't live.without this we are nothing.plants give out oxygen we consume it.oxygen is a very important component of our life.and we can't burn any thing without oxygen(needed dfor combustion process) and many more.not only for our breathing purpose oxygen is needed for many things like to manufacture some metals etc..... Hope this helps.pls mark as brainliest..