What is the nature of nitrogen?

Nitrogen is a colorless, odorless, nontoxic and nonflammable gas with the characteristics of low density, low melting point and boiling point, high inertia and low chemical activity. Inert in chemical reactions, not easy to react with other substances, but can trigger chemical reactions at high temperature or high pressure.

Nitrogen is an element and one of the most common elements in nature, accounting for 78% of the air. Nitrogen is also a colorless, odorless, nontoxic and nonflammable gas. Nitrogen plays a very important role in natural processes, such as the composition of life and the manufacture of fertilizer.

2. The density of nitrogen is lower than that of air, about 1.25g/L, which is about 0.8 times lighter than that of air. Therefore, nitrogen will rise when mixed with air, and will not accumulate downward like heavy gas. This is also a major reason for the safe use of nitrogen.

3. Under the standard atmospheric pressure, the melting point of nitrogen is -2 10℃ and the boiling point is-196℃ ... This also means that nitrogen is a gas that will not solidify at room temperature. This feature allows people to use liquid nitrogen for refrigeration, and nitrogen can reach a very low temperature in liquid state.

4. The solubility of nitrogen is relatively small, about 0.02g/ 100g water at 20℃. Therefore, nitrogen can form bubbles in water and play an important role in the life of aquatic organisms together with oxygen. In addition, nitrogen can react with other liquid substances such as oil.

Nitrogen is not easy to burn, and it is an element with very inactive chemical properties. However, when the concentration of oxygen is higher than that of nitrogen, nitrogen can be oxidized into nitrous acid, nitric acid and other compounds, forming acidic substances, which are harmful to biology and the environment. At the same time, nitrogen can also generate some compounds, such as ammonia, nitrate, hydrogen sulfide and so on.

6, in the chemical reaction, nitrogen has certain inertia. From a thermodynamic point of view, nitrogen can also be burned, but it needs to be initiated at a very high temperature. Therefore, in fire, explosion and other events, if there is nitrogen, it can help to eliminate or reduce the harm of fire.

7. Nitrogen has a wide range of applications and research fields. As an inert gas, it can be widely used in anticorrosion, alloy manufacturing, electronic industry, rocket launch and other fields. Nitrogen is also an important research object in biological science and environmental science. At the same time, liquid nitrogen has a wide range of application values in scientific research and medical fields.

Use of nitrogen gas

1. Industrial field: In industrial field, nitrogen is mainly used to make alloys, such as steel and stainless steel. It is also widely used in nitrogen generator, gas shielded welding, nitrogen protection, nitrogen booster pump, nitrogen charging, nitrogen cooling, nitrogen drying, nitrogen sealing, nitrogen pneumatic tools and other industries.

2. Science and technology field: Nitrogen is also widely used in science and technology field, such as liquid nitrogen for refrigeration, gas chromatography analysis, gas for nitrogen purification instruments and optical instruments, and separation and measurement of Fallon phenomenon under nitrogen protection. In addition, in the process of semiconductor manufacturing, nitrogen is also used to seal solar cells, triode devices and related structural components.

3. Medical field: In the medical field, nitrogen is mainly used for local anesthesia, such as nitrogen in anesthesia instruments, and some therapeutic and preventive sanitary instruments, such as cryotherapy and preservation technology.

4. Agriculture: As a fertilizer, nitrogen is also widely used in agriculture. Nitrogen can react with water and enzymes in soil to form nitrate ions needed by plants, which can promote the growth and development of plants.