Liquid nitrogen, liquid nitrogen. It is inert, colorless, odorless, non-corrosive, non-flammable and extremely low in temperature. Nitrogen makes up most of the atmosphere. Nitrogen is an inert gas and does not support combustion. A large number of endothermic contacts during vaporization lead to frostbite. Store in a cool and ventilated warehouse. The reservoir temperature should not exceed 30℃. The storage area should be equipped with emergency treatment equipment for leakage.
For liquid nitrogen workers, operators must receive special training and strictly abide by the operating procedures. Operators are advised to wear winter clothes and gloves. Prevent the gas in the workplace from leaking into the air. Lightly load and unload when handling, so as to prevent the cylinders and accessories from being damaged. Equipped with leakage emergency treatment equipment.
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Liquid nitrogen is chemically inert, can directly contact with biological tissues, and can be frozen immediately without destroying biological activity, so it is widely used in many fields.
Such as low-temperature physics's research; Demonstrate the low temperature state in science education; Providing the temperature required for high-temperature superconductors to show superconductivity; Can be used as a raw material for industrial production of nitrogen fertilizer; It can be used as a refrigerant to quickly freeze biological tissues and prevent them from being destroyed.
Liquid nitrogen can quickly freeze food or make ice products. For example, Malaysian durian imported from China will be immediately quenched with liquid nitrogen (-80℃ to-1/kloc-0℃ not less than1hour) before storage and transportation.
Baidu Encyclopedia _ Liquid Nitrogen