The nitrogen concentration in the atmosphere is about 78,03%, being therefore the air the main commercial source of this element. After liquefaction, air is proceeded to a set of fractional distillations to separate the several components, among which nitrogen is present. Wrobliski and Olzewski liquefied this elementary substance for the first time in 1883. Nitrogen can also be produced through the combustion of carbon or hydrocarbons of the air, extracting carbon dioxide and water from the gaseous products through appropriate techniques.