Storage and transportation of liquid nitrogen
Liquid nitrogen is a low-temperature, dry substance, which needs special attention in storage and transportation. Liquid nitrogen should be stored in a well-ventilated place, away from direct sunlight and fire sources and high temperature areas. When transporting, use a special liquid nitrogen tank and ensure that it is well sealed to prevent leakage.
Step 2: Get liquid nitrogen
When using liquid nitrogen, you should wear protective gloves, protective glasses and protective clothing to avoid low temperature burns and frostbite. When using liquid nitrogen, the container should be precooled with special tools first, and then the valve should be slowly opened to let the liquid nitrogen flow out.
3. Vaporization of liquid nitrogen
Liquid nitrogen is usually used for refrigeration or freezing in medical, industrial, scientific research and other fields. If liquid nitrogen is to be evaporated, it needs to be treated. Firstly, liquid nitrogen is poured into a special vaporizer, and then the vaporization speed and quantity of liquid nitrogen are controlled by adjusting the temperature and pressure. Evaporated nitrogen can be used for various purposes, such as creating a low-temperature environment in high-energy physics experiments.
Second, matters needing attention in the use of liquid nitrogen
1. Avoid high temperature and direct sunlight.
Liquid nitrogen is a low-temperature, dry substance, which is prone to danger when exposed to high temperature and direct sunlight. Therefore, when using liquid nitrogen, high temperature environment and direct sunlight should be avoided.
Avoid contact with water
Liquid nitrogen is an extremely cold substance. If it comes into contact with water, it will have a violent reaction and even cause serious injury. Therefore, when using liquid nitrogen, contact with water should be avoided.
Avoid inhaling liquid nitrogen.
Liquid nitrogen is gaseous at room temperature, but it remains highly toxic after pressurized liquefaction, such as. Inhalation of liquid nitrogen can lead to suffocation and poisoning. Therefore, when using liquid nitrogen, you should keep a good ventilation environment, wear protective equipment and avoid inhaling liquid nitrogen.
Avoid contact with skin.
The temperature of liquid nitrogen is extremely low, and if it comes into contact with skin, it will lead to skin frostbite and other dangers. Therefore, when using liquid nitrogen, personal protective equipment such as protective gloves, protective glasses and protective clothing should be worn.
5. Pay attention to the safe use of containers
Tubular liquid nitrogen tank
The storage and transportation of liquid nitrogen need to use special liquid nitrogen containers, and safety should be paid attention to when using these containers. Improper use or damage of the container may lead to the danger of liquid nitrogen leakage or explosion of the container. Therefore, when using liquid nitrogen, we should use qualified containers and pay attention to the sealing and safety of the containers.