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[Chemical Knowledge]：Helium role, master scientific and practical knowledge, enjoy the fun of life

Read： 510 Time：24months ago Source：Transform the World with Simplicity

Helium is a colorless, odorless, non-toxic gas with high thermal and chemical stability, and is one of the least rare gases in the earth's atmosphere. Although the content of helium in the air is very small, it plays an important role in people's daily life and industrial production. The role of helium and its applications in different fields will be described in detail below.

1. the role of helium

1 for balloon inflation: Helium is a relatively light gas, about 7 times lighter than air, heavier than hydrogen, not easy to burn, explosion, often used for inflatable balloons, balloon fireworks and other celebration decoration, add joy atmosphere.

2 for helium welding: the chemical properties of helium is more stable, as an inert gas, helium rarely react with other substances. Therefore, in some need to heat the welding of metal, alloy materials, etc., helium can be used as a protective gas to prevent the material and the air in the oxygen, water vapor and other substances reaction, to ensure the quality of the weld.

3. for medical diagnosis: in the medical field, helium is mainly used in magnetic resonance imaging (MRI) and other testing equipment, through the ultra-high sensitivity to helium, can be more accurate and clear imaging analysis of human internal tissues and organs, has important clinical diagnostic value. The application
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2. helium in different fields
1. Aerospace field: Helium can be used not only for balloon inflation, but also for cooling and propulsion of rocket engines, because helium has good thermal conductivity and cooling effect, which can help rocket engines work in high temperature environment and play a propulsion role.

2. scientific experiment field: helium as an inert gas is widely used in the field of scientific experiments, such as astronomy research, physics research, etc., can be used for bubble chamber detection and other experiments.

3. Electronic product manufacturing field: Helium is also often used in the field of electronic product manufacturing, such as semiconductor chip production process, can use helium as a coolant, to ensure that the chip will not be damaged by high temperature.

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