Why is there particularly much nitrogen and oxygen in the Earth s atmosphere 100

Nitrogen and oxygen are electron-poor elements, and both of them have the ability to take electrons from electron-rich elements, both oxidizing. It's just that nitrogen is not very reactive, and it can only seize electrons from other elements at high temperature and pressure.

In the early days of the earth, it was just an asteroid, relying on gravity to continuously capture foreign celestial bodies to strengthen itself, and foreign celestial bodies were moving at high speed relative to the earth, so the process of capture was a violent collision. The energy of the collision combined with the transformation energy of the heavy elements melts the earth into a sea of magma. Under the action of gravitational contraction and liquid surface tension, gravitational differentiation occurs (the heavier ones sink and the lighter ones float) and the earth shrinks into a sphere.

We know that hydrogen is the most prevalent substance in the universe, and it is no exception in the Earth, but the Earth is not big enough to gravitate enough to grab hydrogen, and most of the hydrogen runs into outer space. However, at high temperatures and pressures in the early days of the earth's formation, nitrogen and hydrogenation synthesized ammonia, oxygen and hydrogenation synthesized water, and carbon dioxide and methane were also produced. These are volatile gases that are expelled as the Earth's gravitational pull contracts to become the primordial atmosphere.

The Earth is still venting, and it is these gases that are emitted when volcanoes erupt.

Let's talk about the evolution of the primordial atmosphere.

Ammonia is subjected to photodecomposition in the upper layers of the atmosphere, producing nitrogen and hydrogen that subsequently escapes into space. Therefore, nitrogen is the dominant component in the atmosphere when life appears.

Oxygen in the modern atmosphere is almost entirely produced by photosynthesis. Small amounts of oxygen can also be produced in the upper layers of the atmosphere through photolysis of water molecules.

In the early days of the earth, the air was mainly carbon dioxide, and later plants multiplied and photosynthesis turned carbon dioxide into oxygen.

Certain plants produce nitrogen through fractionation, volcanic eruptions and other actions can also produce it.

This is related to the evolution of organisms on the earth's surface, and the photosynthesis of organisms produced by evolution gradually changed the composition of the atmosphere, as can be seen in the "Gaia hypothesis".

Nitrogen is not easy to react, the molar mass is not large (nuclear reactions are easy to produce) and not small (it can be captured by the earth), and oxygen is produced by photosynthesis.

Summary. The reason why nitrogen is large in the air is closely related to its biological role in addition to the natural evolution of the earth. Organisms need nitrogen as a nutrient during their growth and absorb it through nitrogen in the air.

This absorption increases the concentration of nitrogen, making it one of the most dominant atmospheric gases on the Earth's surface. In addition, nitrogen plays an important role in regulating the global environment. Nitrogen is an important component of the ozone layer and plays an important role in protecting the earth from the sun's ultraviolet rays.

Therefore, the existence of nitrogen is of great significance to the living environment of life on earth and human beings.

The nitrogen in the air is mostly because it is stable and does not react easily with other substances, so the content of Rock Shen potato in the atmosphere is relatively large. Other gases, such as oxygen and carbon dioxide, are less abundant in the coarse air, but they have important biological functions, such as oxygen is essential for biological respiration, and carbon dioxide has an important impact on plant growth and environmental balance.

Nitrogen is one of the main components of the earth's atmosphere, and it is mainly responsible for biological decay, volcanic activity and microbial metabolism. These factors make nitrogen increase in the Earth's atmosphere at a faster rate than other gases. At the same time, nitrogen also has relatively high stability, and it is not easy to undergo physical and chemical reactions in the Ono gas dismantling, so that it can exist in the earth's atmosphere for a long time.

So, nitrogen is the reason why there is more nitrogen in the air and less than other gases.

I can go on and on.

On the physical side.

Air is a complex mixture of gases containing many different gases such as oxygen, nitrogen, carbon dioxide, helium, etc. Among them, nitrogen is the main component of the atmosphere, accounting for about 78% of the total volume of the atmosphere. This different ratio depends on natural processes on Earth, such as the movement of the Earth within the liquid mantle, physical processes in the solar system, and biological processes.

Physical processes include lead segment diffusion in the atmosphere, thermodynamic effects, and natural motion. Biological processes include the impact of organisms on the environment and the impact of organisms on the atmosphere.

The reason why nitrogen is large in the air is closely related to its biological role in addition to the natural evolution of the earth. Organisms need nitrogen as a nutrient during their growth and absorb it through nitrogen in the air. This absorption increases the concentration of nitrogen, making it one of the most dominant atmospheric gases on the Earth's surface.

In addition, nitrogen plays an important role in regulating the global environment. Nitrogen is an important component of the ozone layer, which plays an important role in protecting the earth from the sun's ultraviolet rays. Therefore, the existence of nitrogen is of great significance to the living organisms on the earth and the living environment of human beings. Zibi.

Nitrogen in the air accounts for 78%, oxygen accounts for 21%, and others account for 1%.

This is the optimal ratio.

Although oxygen is necessary for humans and animals, it can't be all oxygen, otherwise, a lot of things are easily oxidized, and they can be easily burned, for example, in experiments, the combustion in pure oxygen is much more intense than in the air.

Moreover, nitrogen is inseparable from the growth of plants, and nitrogen and hydrogen in the air can synthesize ammonia, which is absorbed by plants.

Because other gases are oxidized, such as ammonia, hydrogen, methane, etc., only chemically bonded nitrogen is left unoxidized, so it is retained.

Because humans only need oxygen to breathe, only oxygen.

The gas required for human breathing is oxygen.

Because if you absorb nitrogen, then the concentration is too high, and it will suffocate.

Inhalation of high-purity nitrogen can lead to hypoxia and suffocation and death.

Because the concentration of central enterprises is relatively not very high.

Humans do aerobic respiration.

Humans can only breathe when they are aerobic.

Because the concentration is too high, it is not good for the body.

Because nitrogen can't be absorbed.

I think it's mostly with oxygen and nitrogenChemical propertiesRelate.

There is a lot of oxygen and nitrogen in the air, and the composition of the air is also quite complex. But in the vast majority of cases, in the normal ecological environment as well as ecosystems.

In the middle. The content of nitrogen far exceeds that of oxygen, and even nitrogen can be found everywhere in life. However, we don't know much about nitrogen, mainly because the demand for nitrogen by humans can be said to be almost none.

In the air, nitrogen already occupies the vast majority of the Yuanzhi slag. But we can also find a strange place, and that is that when humans were on Earth, they needed oxygen instead of nitrogen. Logically speaking, the amount of oxygen in the air is much less than that of nitrogen, so it is much easier for humans to obtain nitrogen than oxygen.

But in fact, this is not the case, and the nitrogen content in the air exceeds that of oxygen. It is mainly related to the chemical properties of nitrogen.

Compared to oxygen, nitrogen is chemically stable. Just as nitrogen can't burn, oxygen can act as an accelerant to help objects burn. It can even oxidize the substance, and this positive description of oxygen is very reactive.

Then human beings can obtain oxygen to meet all aspects of the cell's chemical reactions.

However, when its properties are too stable, nitrogen must consume a lot of energy if it wants to undergo a chemical reaction. This is fundamentally different from oxygen.

In addition to that, I think it's also due to the selection of cells. Because every cell in the human body is basically made up of proteins. However, nitrogen already accounts for the vast majority of proteins.

If humans rely on nitrogen for breathing, then it is likely to cause the body's cells to break down, which will eventually lead to the continuous death of our cells.

This is mainly because nitrogen and oxygen have completely different chemical properties, and human survival mainly depends on oxygen, which has nothing to do with nitrogen.

Because only oxygen can meet the normal survival of human cells and allow the human body to function normally.

Because only oxygen can be absorbed by the body and then used to maintain the characteristics of life.

As we all know, everyone's survival mainly depends on the oxygen on the earth, you must know that nitrogen accounts for 78% of the air content, not only is it much higher than oxygen, but nitrogen has a wider range of applications than oxygen, but the life on the earth can only survive on oxygen, which is for a certain reason, and then I will introduce it to you. <>

1. Why do organisms on Earth survive only on oxygen, not nitrogen?

First of all, we must know that although the air content of nitrogen is very high, nitrogen can not be converted and absorbed by our human body, nitrogen is a natural gas, oxidation is also very weak, will not react with other substances, if you inhale nitrogen for a long time, then it will lead to certain problems in our body, and the metabolic efficiency of nitrogen will be very slow, which will lead to a lot of diseases in the body, and even threaten life. Secondly, nitrogen inhalation into the human body, will not circulate to all parts of the body, will only stay in our lungs for circulation, neither into the cells, but also with some blood in the body chemical reaction, so nitrogen inhalation into the body can not be digested and absorbed by the body, long-term inhalation of nitrogen, will lead to too much nitrogen in the lungs, thus affecting our breathing. <>

2. Oxygen can participate in the reaction

But oxygen is different, oxygen can participate in many reactions, and the oxygen inhaled from the nostrils or mouth will pass through all parts of the body, not staying in the lungs, but also entering the blood through some channels or nerve cells, so as to react with the cells in the blood to maintain the oxygen needed by the body. <>

III. Conclusion

Finally, I would like to say that oxygen is very important for us, you must know that many people will go to some Qinghai-Tibet or Xinjiang areas for tourism, but their altitude sickness will be very serious, which is because of the lack of oxygen, so oxygen is of great significance to the human body, not only the same as the food eaten and the water drunk in daily life, but also to ensure life.

Because nitrogen is a very inactive gas and hardly participates in any biochemical reactions, while oxygen is an indispensable gas for life, oxygen is involved in almost all biochemical reactions.

Because oxygen is made of molecules, oxygen can be converted into energy, so life on Earth can only survive on oxygen.

Although nitrogen is a natural gas, it cannot be absorbed and converted by the human body, so people can only rely on oxygen to stockpile.