What are the uses of oxygen and nitrogen in the air?

The use of oxygen in the air is as follows:

1, medical treatment and breathing: oxygen is an essential element in the process of human breathing. When we breathe, our lungs inhale oxygen from the air and then expel carbon dioxide from the body. In the medical field, oxygen is often used to treat various diseases, such as asphyxia, asthma and chronic obstructive pulmonary disease.

2. Combustion and energy: Oxygen is an essential element in the combustion process. It combines with fuel to produce energy and carbon dioxide. For example, in coal-fired power stations and automobile engines, oxygen reacts with fuel to generate energy.

3. Industrial production: In industrial production, oxygen is often used for welding, cutting and fertilizer production.

4. Scientific experiments: In scientific laboratories, oxygen is often used as an experimental reagent for various chemical reactions and scientific experiments.

Use of nitrogen:

1. protective gas: nitrogen is usually used as a protective gas because it does not participate in chemical reactions and will not cause oxidation or corrosion. In the process of food processing and storage, nitrogen is often used to maintain the freshness and quality of food. In addition, nitrogen is also commonly used in packaging industry to extend the shelf life of food.

2. Industrial production: In industrial production, nitrogen is often used to produce urea, nitric acid and other chemicals. In addition, because of its large volume, nitrogen is often used to dilute gas and clean pipelines.

3. Refrigerant: Because of its low boiling point, nitrogen is used as a refrigerant in the refrigeration industry. For example, liquid nitrogen is used to create a low temperature environment or to cool food and materials.

4. Medicine and Science: Nitrogen also has some applications in medicine and science. For example, high concentration of nitrogen can be used to treat some diseases, such as cyanide poisoning. In addition, nitrogen is often used in an inert environment in scientific experiments.

5. Agricultural application: Nitrogen also plays an important role in agriculture. Plants convert carbon dioxide and water into organic matter through photosynthesis, and nitrogen is one of the key elements for plant growth and development. Nitrogen fertilizer (such as urea) can provide necessary nitrogen for plants and promote plant growth and yield. In addition, biomass farms also regard nitrogen as a substitute for carbon dioxide to produce renewable energy.