What is the significance of summing up air for us?

1, air can support combustion (because there is oxygen in the air)

Air is a necessary condition for the survival of animals and plants on the earth. The respiration of animals and the photosynthesis of plants are inseparable from the air energy used for breathing. 3. Air has pressure and plays an important role in human production and life.

Air has buoyancy, and birds and planes can fly in the air by it.

The atmosphere can block all kinds of rays from space and protect the life on earth from them.

6. Most meteorites and meteors from the universe are melted after entering the atmosphere.

7. The atmosphere still covers the earth like a thick quilt, enabling us to live in an environment that is neither too cold nor too hot.

8. Air is the space where the universe arranges matter. Everything in the space is blocked by air. The atmosphere can keep the temperature on the earth relatively stable.

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What are the benefits of air to human beings?

There is oxygen and carbon dioxide in the air. Breathing oxygen can activate cells in our body, while carbon dioxide can excite nerves and promote our breathing. Pure air can soothe the nerves and make the mind calm and peaceful. The fresh air in the room makes you have a quieter and better sleep. Fresh air can make the body full of vitality. Extended data:

Due to the strong gravity of the earth, 80% of the air is concentrated in the average range of 15 km from the ground. This air layer has a great influence on human life and production activities. What people usually say about air pollution refers to the air pollution within this range. Air is a necessary condition for the survival of animals and plants on the earth, and the respiration of animals and the photosynthesis of plants are inseparable from air; The atmosphere can keep the temperature on the earth relatively stable. If there is no atmosphere, the temperature will be high during the day and low at night. The ozone layer can absorb the ultraviolet rays of the sun and protect life on earth from harm; The atmosphere can prevent high-energy particles from entering the earth too much and prevent meteorites from hitting the earth, because meteorites can slow down and burn when they rub against the atmosphere; The formation of wind, clouds, rain and snow is inseparable from the atmosphere; Sound travels through the air. Baidu Encyclopedia-Air Baidu Encyclopedia-Air Quality

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What's the difference between atmosphere and air?

The atmosphere is all the air around the earth. It is an important substance on which all life on earth depends. The atmosphere not only rotates with the earth, but also has complex movements relative to the crust. The total mass of the atmosphere is about 5.32× 10 kg, accounting for about one millionth of the total mass of the earth, of which 99.9% is concentrated below the surface. The density and pressure of the atmosphere decrease exponentially with height. The dry air near the surface weighs 1.293g per cubic decimeter under standard conditions, and the average sea level pressure is about1.01.3kpa. The atmosphere is a multi-component mixed gas mainly composed of oxygen and nitrogen, including water droplets (cloud droplets and fog droplets), ice crystals and solid particles (such as dust, spores and spores) ) it's all suspended. The atmosphere is dry and clean (no water vapor and suspended matter), accounting for 99.96% of the total volume of the atmosphere. In the atmosphere below 85 kilometers, the volume ratio of these main gases and trace gases such as neon, helium, krypton and hydrogen is basically the same at all heights. In addition, there are some gases, such as carbon dioxide, water vapor and ozone, which are rare in the atmosphere, but their contents vary with height, time and place. It has a great influence on the physical conditions of the atmosphere. Water vapor is the only component in the atmosphere that can change phase (gas, liquid and solid change each other), and it is also one of the most easily changed components. Its content varies from 0% to 4% by volume. There is not much water vapor in the atmosphere, but important weather phenomena such as clouds, fog, rain and snow in the atmosphere are related to their content and phase change. The content of carbon dioxide (by volume) However, because it can strongly absorb and emit long-wave radiation, it has an impact on the temperature. The ozone content in the atmosphere is less than one in ten thousand, mainly distributed at the height of 5-50 kilometers, and the maximum value is at the height of 20-25 kilometers. Ozone has a strong ability to absorb ultraviolet radiation from the sun, which greatly increases the temperature at a height of 40-50 kilometers. It can also protect life on the ground from excessive ultraviolet radiation. According to the temperature change, ionization state and the distribution of chemical reactions with height, the whole atmosphere can be divided into several levels. According to thermal properties, the atmosphere can be divided into troposphere, stratosphere, mesosphere, thermosphere and exosphere from top to bottom. According to the ionization characteristics of the atmosphere, it can be divided into neutral layer, ionosphere and magnetosphere. Air is mainly composed of 78% nitrogen, 265,438+0% oxygen and many rare gases and impurities. The composition of air is not fixed, and the proportion of air will change with the change of altitude and air pressure. Generally speaking, the atmosphere refers to the atmosphere on the surface of the earth; Air: generally speaking, it refers to the gas on which people live. In short, the atmosphere and air are the same substance, but they refer to different situations. According to the definition of the International Organization for Standardization (ISO), "air pollution usually refers to the phenomenon that some substances enter the atmosphere due to human activities or natural processes and present sufficient concentration in sufficient time, thus endangering human comfort, health and welfare or environmental pollution".

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What effect does air have on the environment?

Air pollution refers to the phenomenon that a substance enters the atmosphere due to human production and living activities, which changes the chemical, physical and biological characteristics of the atmosphere, affects people's life and work, endangers human health, affects or endangers the survival of various organisms, and directly or indirectly damages equipment and buildings. The air quality reflects the degree of air pollution, which is judged according to the concentration of pollutants in the air. Air pollution is a complex phenomenon. At a specific time and place, the concentration of air pollutants is affected by many factors. Man-made pollutant emissions from fixed pollution sources and mobile pollution sources are one of the most important factors affecting air quality, including vehicle, ship and aircraft exhaust, industrial enterprise production emissions, residents' living heating, garbage incineration and so on. Urban development density, topography and meteorology are also important factors affecting air quality. With the rapid development of social economy and the improvement of industrialization level, human activities have an increasing impact on the environment, especially in cities where a large number of factories, vehicles and personnel are concentrated. Due to the above reasons, the air quality is deteriorating, where it is deteriorating, how bad it is, and what is the development trend. Experts care, people care, and the government cares more. Publicly publishing the air quality status in the news media is an initiative of the government to do practical things for the people and a basic work of environmental protection in line with international standards. It is not only conducive to the openness and transparency of environmental protection work, but also helps to promote public awareness and participation in environmental protection work. According to the different reporting time, the air quality can be divided into: the hourly report is called twice; What is reported every day is called a daily newspaper; A weekly report is called a weekly report. Air pollution pollutants include: smoke and dust, total suspended particles, respirable suspended particles (floating dust), nitrogen dioxide, sulfur dioxide, carbon monoxide, ozone, volatile organic compounds and so on. Preventing air pollution and controlling pollution discharge are fundamental measures to improve air quality. The main ways are: reasonable industrial layout and good environmental planning; Change the energy structure, popularize clean fuels and adopt clean production technology to reduce pollutant emissions; Strengthen energy conservation, improve energy utilization rate and regional central heating; Strengthen environmental supervision and management and control of old pollution sources, and implement total control and discharge up to standard; Strictly control automobile exhaust emissions. Plants can filter all kinds of toxic and harmful air pollutants and purify the air, especially trees, so afforestation is a more economical and effective measure to prevent and control air pollution.

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The significance of air to human life.

Another problem of improper use of words. How does air have an important "understanding" of human life? Is air as cognitive as people? It is reliable to say "the importance of air to human life". This is actually an easy question to answer, that is, to list the various functions and phenomena of air. At the same time, it is inevitable to collect some relevant information and match it with examples. Obviously, the scope of the topic is very large, and I am afraid that the number of words in the answer will exceed the prescribed limit. If you want to do such a long article every day, it is estimated that even the most basic tasks will be difficult to complete. There are many such problems on the platform, and I really hope to "solve the doubts as soon as possible and come to another village"!

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What role does the atmosphere play in human living environment?

The earth has a spherical structure, including the atmosphere, hydrosphere, biosphere and lithosphere. In these circles, the atmosphere belongs to the outermost layer. The thick atmosphere surrounds the earth where we live. It is because of the atmosphere that everything grows. The role of the atmosphere in the earth's environment can be summarized as follows: (1) Oxygen is a necessary substance for human beings and all living things to maintain life activities. Green plants carry out photosynthesis, absorbing carbon dioxide from the atmosphere and releasing oxygen to produce organic matter. Biological respiration, absorbing oxygen from the atmosphere and discharging carbon dioxide, is endless. Therefore, it can be said that there would be no human beings and all living things without the atmosphere. (2) The atmosphere has played a very good role in protecting human beings and creatures on the earth. Ozone can absorb a large amount of ultraviolet rays in the sun, so that humans and creatures are protected from a large amount of ultraviolet rays, and a small amount of ultraviolet rays that penetrate the atmosphere and reach the ground are playing a role in sterilization and disinfection; The atmosphere has a certain heat preservation effect on the ground, so that the surface heat will not be excessively lost; It also eases the change of surface temperature, so as not to suddenly increase or decrease like the temperature of the moon; The atmosphere is also a barrier to prevent the collision of materials from space, which makes interstellar materials burn into ashes by friction with the atmosphere. (3) Dust in the atmosphere can be used as condensation nuclei, which makes water vapor condense into clouds and cause rainfall. After the surface water evaporates, it returns to the atmosphere, and the water circulates repeatedly. If there is no atmosphere, the water on the earth will evaporate quickly if it doesn't circulate. (4) Clouds, dust and air molecules in the atmosphere can reflect and scatter sunlight, so that the surface will not suddenly brighten and darken. There is a transition time in the morning, dawn, evening and night. In rainy days, although sunlight can't shine directly on buildings, it still has a certain brightness, which is attributed to the reflection and scattering of solar light by the atmosphere. (5) The role of the atmosphere is one of the basic factors that form the thermal state of surface water. Hydrothermal conditions determine the climate characteristics in a certain range. The climatic characteristics of a region directly affect the hydrological, geomorphological, soil and biological conditions of the region. These conditions are unfavorable to the climate. The natural environment they form is a unified whole with dialectical unity. This dialectical and unified natural environment on the earth is just suitable for the survival of human beings and all living things.

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1.9 million views 7 1 likes 1. Air can help combustion (because there is oxygen in the air).