It is used as an inert gas in welding, rocket propulsion, balloon flight, hyperbaric chambers, deep-sea diving (see nitrogen narcosis), gas chromatography, luminous signs, and cryogenics.

• 还可当作一种惰性气体应用于电弧焊接、火箭推进、气球飞行、高压室、深海潜水、气相色层分析法、发光讯号和低温技术。