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Anonymous users2024-01-24Due to the chemical inertness of nitrogen, it is often used as a shielding gas, such as: melons and fruits, food, light bulb filling gas. In order to prevent some objects from being oxidized by oxygen when exposed to air, fill the granary with nitrogen, which can make the grain not rotten and germinate, and be stored for a long time. Liquid nitrogen can also be used as a deep freezer.
It is also often used as a cryogen in the hospital for surgery to remove spots, bags, beans, etc., that is, to freeze off spots, bags, beans, etc., but it is prone to scarring, so it is not recommended. High-purity nitrogen is used as a carrier gas for instruments such as chromatographs. It is used as a bright annealing shielding gas for copper tubes.
Together with high-purity helium and high-purity carbon dioxide, it is used as a laser gas for laser cutting machines.
Nitrogen is also used as a protective gas for food preservation. In the chemical industry, nitrogen is mainly used as a shielding gas, a displacement gas, a washing gas, and a safety guarantee gas. It is used as a shielding gas for aluminum products, aluminum profile processing, aluminum thin rolling, etc.
It is used as a shielding gas for reflow soldering and wave soldering to improve the quality of soldering. It is used as a shielding gas in the production process of float glass to prevent oxidation of the tin bath.
The main way for humans to be able to effectively use nitrogen is through the synthesis of ammonia, but the requirements are very high. In recent years, people have been trying their best to understand the mechanism of plant nitrogen fixation, and strive to use chemical methods to simulate biological nitrogen fixation, so as to realize the development and utilization of nitrogen resources in the air under mild conditions.
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