Oxygen has wide application in many fields of Industry. In metallurgy it is used for obtaining high quality steel in Martin and Blast furnaces, it has also wide usage in oxy-fuel welding and cutting. Liquid oxygen is used as oxidizer in rocket engines. Liquid oxygen is widely applicable in medicine for treatment of many kinds of diseases, also in reanimate rehabilitation processes. In chemical production, oxygen is used to produce alcohol, aldehydes, organic acids and etc. Oxygen also is used in agriculture, especially in green houses, cattle rearing and fishing.