What is liquid nitrogen

2020-07-06 17:07:59

       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 and 75.5% by weight). Nitrogen is inactive and does not support combustion. During vaporization, a large amount of endothermic contact causes frostbite; nitrogen accounts for 78% of air. Under normal pressure, the liquid nitrogen temperature 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, low-temperature liquid and gas under high pressure. Liquid nitrogen (often written as LN2) is the liquid form of nitrogen at low temperatures. The boiling point of nitrogen is -196°C. Under normal atmospheric pressure, if the temperature is below this, liquid nitrogen will be formed; if pressurized, liquid nitrogen can be obtained at a higher temperature. In industry, liquid nitrogen is obtained by fractional distillation of air. After purifying the air, it is liquefied under a pressurized and cooled environment and separated by the different boiling points of the components in the air. 

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