Liquid nitrogen tanks, also known as non-pressure liquid nitrogen containers, are containers marked with capacity and caliber for long-term storage of biological samples. They can be used to store and transport liquid nitrogen. Why are liquid nitrogen tanks without pressure?

Liquid nitrogen is a cryogenic liquid at -196℃, and its boiling point is very low. Its stability is not very good in a room temperature environment, and it will evaporate as soon as it comes into contact with room temperature. When the liquid evaporates into gas, it is under pressure. If the pressure remains in the tank and cannot be discharged, it will continue to accumulate and then expand, and an explosion may occur when it exceeds the range that the liquid nitrogen container can withstand, which is very dangerous. Therefore, considering the safety issue, in order to make the liquid nitrogen container safer, a gap will be left at the neck plug to allow its pressure to have an outlet. Besides, there is no need for pressure to store biological samples.

Liquid nitrogen biological container should be stored in a well-ventilated, cool place, and not exposed to direct sunlight. Whether in use or storage, liquid nitrogen tanks must not be tilted, placed horizontally, inverted, piled, collided with each other or collided with other objects. They must be handled with care and always kept upright.