Nitrogen is an elementary 2-atomic chemical element. In the periodic table of Mendeleev D. I., nitrogen is marked with the letter N (Nitrogenium) and has atomic number 7. Under natural conditions, N is a colorless, odorless, and tasteless gas that can replace oxygen, and is considered an asphyxiating gas. Nitrogen is released from the atmosphere by splitting the air into its components at the enterprises of chemical industry and belongs to the cargo of the 2nd class of hazard. N can be in three aggregate states.

Gas, in which nitrogen is in a normal environment has a density of 1.25 kg/m3. Nitrogen is transported in cylinders and stored in containers with the inscription in yellow color NITROGEN, and the main color is black. The UN No.1066, code 1A II packing group.

Liquid nitrogen is a fluid substance without smell, color, or taste, and has the mobility of water. N has a boiling point t=195.8 ̊C and density=808 kg/m3. Delivery of liquid nitrogen is carried out by gas tankers, and is controlled by the rules for the transport of dangerous goods. Nitrogen is also transported by a gas pipeline.