Nitrogen, N2, is a colorless, odorless, nonflammable compressed gas. Nitrogen makes up the major portion of the atmosphere (78 percent by volume, 75 percent by weight). It is present in all living things in chemical combination. In the form of protein compounds, it is a necessary food for all plants and animals.

For most practical purposes, it is considered chemically inert since it does not react readily with other elements. Nitrogen does not burn and will not support combustion or respiration. It will combine with some of the more active metals, such as lithium and magnesium, to form nitrides.

Nitrogen will also combine with hydrogen, oxygen and other elements at high temperatures. For this reason, it is not recommended as a welding shield, but it is used as an inert protection against atmospheric contamination in many non-welding applications. Nitrogen is only slightly soluble in water and most other liquids and is a poor conductor of heat and electricity.

As a liquid, nitrogen is colorless and odorless and is similar in appearance to water. It is non-magnetic, stables against mechanical shock, and does not produce toxic or irritating vapors.

DOT Class: 2.2 (Nonflammable)

Specific Volume: at 70ºF

DOT Label: Nonflammable Gas

Specific Gravity (Air = 1): 0.967 at 70ºF

UN No. UN1066

Molecular Weight: 28.01

CAS No. 7727-37-9

CGA Valve Outlet: 580

TLV-TWA: None Established

Liquid Temperature: -320.36