Year1
- 小液氮：
- 10Ｌ
Liquid nitrogen: liquid nitrogen. It is inert, colorless, odorless, non-corrosive, non-flammable and has extremely low temperature. Nitrogen makes up the majority of the atmosphere (.% by volume, .% by weight). Nitrogen is inactive and does not support combustion. Extensive heat-absorbing contact during vaporization can cause frostbite. Under normal pressure, the liquid nitrogen temperature is ℃. A cubic meter of liquid nitrogen can expand to a cubic meter d of pure gaseous nitrogen. Liquid nitrogen is a colorless, odorless, low-temperature liquid and gas under high pressure. Liquid nitrogen (often written as) is a liquid form of nitrogen formed at low temperatures. The boiling point of nitrogen is d. If the temperature is below this under normal atmospheric pressure, liquid nitrogen will be formed. If pressurized, liquid nitrogen can be obtained at a higher temperature. .In industry, liquid nitrogen is obtained by fractionation of air. The air is first purified and then liquefied in a pressurized and cooled environment, and the components in the air are separated based on their different boiling points. Nitrogen (.% of the volume of air) escapes first (and is not liquefied), followed by argon, which accounts for .% of the air, and finally oxygen, which accounts for .%.
Small liquid nitrogen is liquid nitrogen stored in liquid nitrogen tanks to facilitate manual transfer or transportation and storage.
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