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[Chemical Knowledge]：Hazards of liquid nitrogen: facts you should know

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Liquid nitrogen is an extremely cold gas, its temperature can reach minus 196 ℃. Therefore, liquid nitrogen has many hazards and risks. In work and life, we often need to use liquid nitrogen for chemical experiments, medical treatment, food processing, etc., but we must also pay attention to the dangers of liquid nitrogen.

First, liquid nitrogen makes a substance extremely brittle. At low temperatures, all substances become very fragile, including human tissues. If you accidentally put your hand into the liquid nitrogen, it will cause serious damage to the tissue and even produce a large area of necrosis.

Secondly, the gas of liquid nitrogen will reduce the oxygen in the air. This can cause people to suffocate while breathing around huge containers of liquid nitrogen. In addition, in a closed room, liquid nitrogen spraying behavior will also reduce oxygen, the human body can not get enough oxygen will lead to suffocation.

In addition, liquid nitrogen can cause fires. Liquid nitrogen can cool the object. If there is oil or other flammable liquid residue on the surface of the object during the cooling process, the cooling effect of liquid nitrogen is also conducive to the expansion of the fire. Therefore, when using liquid nitrogen, it is important to ensure that the surrounding environment is dry and free of flammable substances.

finally, liquid nitrogen can also irritate the skin and eyes. If liquid nitrogen is sprayed directly on human skin, it will freeze the skin instantly, causing burning marks, which may lead to complications such as scarring and ulceration in severe cases. If the liquid nitrogen is sprayed directly into the eye, it will cause the cornea to freeze and crack, leading to blindness.

In short, liquid nitrogen is a dangerous substance, so it is necessary to pay attention to safety issues when using it. In life and work, we should enhance safety awareness and avoid liquid nitrogen accidents. Although liquid nitrogen has many hazards and risks, if it is used reasonably, it can still bring us a lot of help.

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