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Liquid Nitrogen
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Liquid Nitrogen from Airgas

Nitrogen (N2) – makes up 78.03% of air. Nitrogen is often used as an inert gas because of its nonreactive nature with many materials. Gaseous nitrogen is used for storage tank blanketing and vessel inerting applications. It is also used in the electronics and metals industries because of its inert properties.

Liquid nitrogen is produced industrially in large quantities by fractional distillation of liquid air.
Its ability to maintain temperatures far below the freezing point of water makes it extremely useful in a wide range of applications as an open-cycle refrigerant, including use in refrigerant applications such as cryogenic grinding of plastics and food freezing. Available from Airgas in high-pressure and liquid cylinders, as well as MicroBulk and bulk deliveries.

Find liquid nitrogen in these Airgas categories Industrial Application Gases , Medical Gases and Specialty Gases.

Nitrogen MSDSs:
Nitrogen
Nitrogen Dioxide
Nitrogen Trifluoride

Health Effects
While nitrogen is nontoxic and inert, it can act as a simple asphyxiant when inhaled. Eye and skin contact, inhalation and ingestion should all be avoided. In its cryogenic fluid state it can cause instant frostbite on direct contact with living tissue.

Handling and Storage
Do not puncture or incinerate container. Use equipment rated for cylinder pressure. Close valve after each use and when empty. Protect cylinders from physical damage; do not drag, roll, slide, or drop. Use a suitable hand truck for cylinder movement.

Never allow any unprotected part of the body to touch uninsulated pipes or vessels that contain cryogenic liquids. Prevent entrapment of liquid in closed systems or piping without pressure relief devices. Some materials may become brittle at low temperatures and will easily fracture.

Keep container tightly closed. Keep container in a cool, well-ventilated area. Cylinders should be stored upright, with valve protection cap in place, and firmly secured to prevent falling or being knocked over. Cylinder temperatures should not exceed 52 °C (125 °F).

Personal Protection

EyesSafety eyewear complying with an approved standard should be used when a risk assessment indicates this is necessary to avoid exposure to liquid splashes, mists or dusts. When working with cryogenic liquids, wear a full face shield.
SkinPersonal protective equipment for the body should be selected based on the task being performed and the risks involved and should be approved by a specialist before handling this product.
RespiratoryUse a properly fitted, air-purifying or air-fed respirator complying with an approved standard if a risk assessment indicates this is necessary.Respirator selection must be based on known or anticipated exposure levels, the hazards of the product and the safe working limits of the selected respirator. The applicable standards are (US) 29 CFR 1910.134 and (Canada) Z94.4-93
HandsChemical-resistant, impervious gloves or gauntlets complying with an approved standard should be worn at all times when handling chemical products if a risk assessment indicates this is necessary. Insulated gloves suitable for low temperatures.
In case of a large spillA self-contained breathing apparatus should be used to avoid inhalation of the product.


Physical and Chemical Properties
Molecular weight28.02 g/mole
Molecular formulaN2
Boiling/condensation point-195.79°C (-320.4°F)
Melting/freezing point-209.99°C (-346°F)
Critical temperature-146.9°C (-232.4°F)
Vapor density0.967 (Air = 1)
Specific Volume (ft3/lb)13.8889
Gas Density (lb/ft3)0.072