Liquid nitrogen: Liquid nitrogen. It is inert, colorless, odorless, non-corrosive, non-flammable, and extremely low temperature. Nitrogen constitutes most of the atmosphere (78.03% by volume, 75.5% by weight). Nitrogen is inactive and does not support combustion. A large amount of endothermic contact during vaporization causes frostbite.

　　Under normal pressure, the temperature of liquid nitrogen is -196°C; 1 cubic meter of liquid nitrogen can expand to 696 cubic meters of pure gaseous nitrogen at 21°C. Liquid nitrogen is a colorless, odorless, liquid and gas at low temperature under high pressure.

　　Liquid nitrogen (often written as LN2) is a liquid form of nitrogen formed at low temperatures. Nitrogen has a boiling point of -196°C, and liquid nitrogen will form if the temperature is below this under normal atmospheric pressure; if it is pressurized, liquid nitrogen can be obtained at a higher temperature.

　　In industry, liquid nitrogen is obtained by fractional distillation of air. After the air is purified, it is liquefied in a pressurized and cooled environment, and separated by the different boiling points of the components in the air. Nitrogen (78.09% of the air volume) is released first (and has not been liquefied), then is the rare gas which accounts for 0.93% of the air, and finally is the oxygen which accounts for 20.95%. There is no problem when the human skin is directly exposed to liquid nitrogen. It takes more than 2 seconds to get frostbite and it is irreversible.

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