Attention should be paid to when using:
1. Portable household helium tank is equipped with disposable bottle valve to ensure that the gas cylinder can only be used once and cannot be refilled. The filler shall bear legal responsibility for the accidents that may be caused by filling.
2. Portable household helium tanks and bottles should be stored in a cool, ventilated and dry place, and the ambient temperature should not exceed 55℃ ... Try to prevent collisions and drops during transportation, and prevent the bottles from being damaged and deformed.
3. The bursting disc on the steel cylinder should be prevented from knocking, collision and friction with sharp objects. When using, make sure it is operated by an adult.
Extended data
The helium tank is designed and manufactured according to the national standard GB 17268- 1998. It is manufactured by the production line certified by ISO900 1-2000 quality system of AQSIQ. It belongs to the special cylinder product of cylinder DR4 (now classified as B3), and the cylinders are tested one by one before leaving the factory.
Helium is a colorless and odorless gas at room temperature and atmospheric pressure. Its volume content in dry air is 5.24× 10-6. It is the substance with the lowest critical temperature found by human beings. Dark yellow when discharged at low voltage.
Helium cannot be solidified simply by cooling saturated liquid to absolute zero. In order to solidify helium, corresponding pressure must be applied. At 2. 173K, helium will change from a normal liquid to a fluid with unique properties. A liquid with a temperature higher than 2. 173K is called helium Ⅰ. The liquid below this temperature is called helium ⅱ. Helium Ⅱ is a superfluid. Its entropy is zero, its thermal conductivity is extremely high and its viscosity is almost zero.
Because of the low temperature of liquid helium, the resistance of some metals or metal compounds will disappear completely when cooled with liquid helium. This phenomenon is called superconductivity and this temperature is called critical temperature.
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