Nitrogen is a colorless, odorless, non-flammable gas which constitutes over 78.0% of atmospheric air. Commercial nitrogen is the product of air separation, and is used for inerting electrical systems and chemical manufacturing, and for food processing and packaging.

Due to its reactivity under the influence of high heat and chemicals, nitrogen is not used as a shielding gas in the welding industry. It is, however used as a purging and refrigerant gas, and has powered many impact wrenches in the motorsports world.