Broad industrial use of oxygen has begun in the middle of the 20th century, after the invention of turbodetander — devices for liquefaction and division of liquid air.
Converter way of production became or processings of mattes it is connected using oxygen. In many metallurgical units for more effective fuel burning instead of air in torches use oxygen air mixture.
Welding and cutting of metals
Oxygen in cylinders is widely used for oxy-cutting and svarkimetall.
As oxidizer liquid oxygen, hydrogen peroxide, nitric acid and other connections rich with oxygen is applied to raketnogotopliv. Mix of liquid oxygen and liquid ozone — one of the most powerful oxidizers of rocket fuel (specific impulse of mix hydrogen — ozone exceeds specific impulse for couple hydrogen-fluorine and hydrogen-fluoride of oxygen).
Oxygen is used for enrichment of respiratory gas mixtures at breath violation, for treatment of asthma, decompressive illness, prevention of hypoxia in the form of oxygen cocktails, oxygen pillows.
In the food industry
In the food industry oxygen is registered as food dobavkiye948  as propellant and packaging gas.