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1.2%He/N2
1. Helium: is a colorless, tasteless, non-toxic inert gas, with a very low boiling point and high thermal conductivity. It has important applications in many fields, such as providing buoyancy for balloon inflation, and can be used as a protective gas to prevent oxidation in welding.
2. Nitrogen: the same colorless, tasteless, non-toxic, chemical properties are relatively stable. It is not easy to react with other substances under normal temperature and pressure. Nitrogen is often used in industry as a protective gas, refrigerant, etc.
Ii. Use
1. Welding protection: it can prevent metal from being oxidized in the welding process and improve the welding quality.
2. Electronics industry: used in the manufacturing process of electronic products to prevent oxidation and pollution of electronic components.
3. Food preservation: it can be used in food packaging to replace oxygen to extend the shelf life of food.
4. Laboratory application: it is used as a specific environmental gas in some scientific experiments.
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Mixture Gas
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1. Industrial field
1. Welding shielding gas: helium-nitrogen mixture gas can be used as welding shielding gas to prevent metal from oxidation during welding. Helium has good thermal conductivity, nitrogen can reduce costs, and the combination of the two can provide a stable protective atmosphere for welding.
2. Metal heat treatment: In the process of metal heat treatment, helium-nitrogen mixture can be used to control the atmosphere in the furnace to ensure that the metal is heated and cooled in a specific environment to obtain the desired performance.
2. Research fields
1. Laboratory analysis: in some scientific experiments and analyses, helium-nitrogen mixture gas can be used as carrier gas or purge gas. For example, in gas chromatography analysis, a mixture of helium and nitrogen can carry the sample through the chromatographic column to achieve the separation and detection of the sample.
2. Low temperature research: Helium has an extremely low boiling point, and in low temperature research, helium and nitrogen mixture can be used to create a low temperature environment. Nitrogen can adjust the nature and cost of the gas mixture to a certain extent.
3. Medical field
1. Respiratory therapy: In some medical situations, helium-nitrogen mixtures can be used for respiratory therapy. For example, in patients with obstructive airway diseases, the low-density nature of the helium-nitrogen mixture can reduce respiratory resistance and allow for smoother breathing.
4. Other fields
1. Balloon filling: helium-nitrogen mixture can be used to fill balloons. Due to the buoyance of helium and the stability of nitrogen, the balloons filled with this mixture can keep floating in the air for a long time.
2. Diving breathing gas: in some special diving operations, helium-nitrogen mixture can be used as breathing gas. The low solubility of helium reduces the risk of decompression sickness in divers exposed to high pressure.
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1.2%He/N2 0.5%O2/He 4%H2/He 5%H2/N2
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