Uses of Oxygen
(1). Used as an aid for breathing where problem of breathing arises. Example in high altitude flying or climbing, and when a patient is under anesthetics.
(2). In the oxyacetylene (i.e. oxygen-ethyne) flame - used in welding and cutting steel plate - due to the very high temperature of the flame (about 2200oC).
(3). Used in the L-D process for making steel.