Why can t I run out of air? Why is the air not empty

Most of the gases in the air are nitrogen and oxygen, and the reason why the main components of nitrogen and oxygen in the air are relatively constant is the result of the mutual compensation of various changes in nature.

The respiration of animals and plants, the burning of materials, the decay of animals and plants, and the rust of steel all consume a lot of oxygen, but green plants also need to photosynthesize in the sun, that is, inhale carbon dioxide in the air and release oxygen at the same time. Experiments have shown that the total amount of oxygen released by a plant is about 20 times more than the amount of oxygen it needs to breathe. This is the reason why the amount of oxygen remains relatively balanced.

Nitrogen is needed for plant growth. The ** of nitrogen is the nitrogen in the air. Natural nitrogen fixation mainly relies on lightning to oxidize nitrogen into nitric oxide, which is further oxidized into nitrogen dioxide, which is dissolved in rainwater to form nitrite and nitric acid.

into the soil to convert into nitrite and nitrate. It is estimated that about 40 million tonnes of nitrogen can be fixed from the atmosphere each year through this pathway, and a small amount of nitrogen is fixed by rhizobia in legumes; The main way of artificial nitrogen fixation is the synthesis of ammonia from nitrogen. The fixed nitrogen can be broken down into nitrogen by a class of microorganisms called denitrifying bacteria and returned to the atmosphere.

In this way, another cycle in nature is completed, the nitrogen cycle, so that the amount of nitrogen in the atmosphere is almost constant. Therefore, the air is inexhaustible.

Because you've inhaled a bunch of air and exhaled a bunch of gas. -When the microorganisms decompose the corpse, they also release a bunch of CO2.

The factory burns coal and emits a bunch of (harmful) gases.

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Humans, animals and plants on the earth are absorbing oxygen and exhaling carbon dioxide all the time. Why can't the earth run out of oxygen?

Photosynthesis consumes carbon dioxide to produce oxygen, and respiration consumes oxygen to produce carbon dioxide.

Conservation.

The exchange of matter, the conservation of energy.

The law of conservation of air mass and energy.

Kindness. This one.

Then I'll ask you.

Why do you think the air is running out?

The air we breathe every day"Life gases", which covers the earth's surface in layers, is transparent and colorless and odorless, it is mainly composed of nitrogen and oxygen, and has an important impact on human survival and production. Air refers to the mixture of gases in the Earth's atmosphere. It is mainly composed of 78% nitrogen, 21% oxygen, noble gases (helium, neon, argon, krypton, xenon), carbon dioxide, and other substances (such as water vapor, impurities, etc.).

The composition of air is not fixed, and as the altitude changes, the air pressure changes, and the proportion of air composition also changes. But for a long time, it was believed that air was a single substance, until later the French scientist Lavoisier first came to the conclusion that air is composed of oxygen and nitrogen through experiments. At the end of the 19th century, scientists discovered through a large number of experiments that there were rare gases such as helium, argon, and xenon in the air.

In its natural state, the air is tasteless and odorless.

Oxygen in the air is necessary for all aerobic organisms. All animals need to breathe oxygen. In addition, plants use carbon dioxide in the air for photosynthesis, which is the only carbon in almost all plants.

In fact, air is a transparent mixture of gases, composed of nitrogen, oxygen, water vapor, carbon dioxide and many other substances, of which oxygen and nitrogen have the largest content, accounting for about and about respectively, and other substances, adding up to less than 1% of the total amount of air.

No, the plant's own photosynthesis absorbs carbon dioxide and releases oxygen.

In 1771, Schoele, a Swedish pharmacist, threw a piece of rubber-like white phosphorus into an empty bottle. White phosphorus is a grumpy guy who "gets angry" for no apparent reason – spontaneously combusts in the air. Scheler found that after the white phosphorus burned, about 1 5 of the gas in the bottle was lost, and the little mice died quickly in the remaining gas.

This incident caught the attention of the French chemist Lavoisier. He conducted a detailed study and finally came to the conclusion that the lost 1 5 gases are called "oxygen", and the rest is "oxygen" that does not support combustion.

It is now determined that about 21% of the dry air is oxygen, 78% nitrogen, and about 1% of other gases. So the air is not "empty".

Hope it helps.

Because there's a gas behind it, so what looks like empty is actually gas.

Air, hence the name Si Empty space of gas. It is colorless, odorless and transparent, but it is a big family of many members.

The volume fraction for each member is:

78% nitrogen and 21% oxygen

Noble gas. Carbon dioxide.

Other gaseous impurities.

There are gas molecules, such as oxygen, nitrogen.

Because the earth has a large enough gravitational pull to adsorb gas molecules.

The corresponding moon has almost no atmosphere (and there was also an atmosphere in the early days), because its gravitational pull is small, and it is blown away by the solar wind; Too much gravity is not a good thing, such as Jupiter's atmosphere, the Galileo Jupiter probe is still landing, it is crushed by the atmosphere, and people are even more unable to live.

When the earth was formed, there was also no atmosphere. Over the course of a billion years, the Earth's surface temperature has cooled, and asteroids (impacts) have brought water and gas with them, and some of them have been brought out of the ground due to volcanic activity. With the right temperature, liquid water begins to cover most of the earth's surface, and then evaporates after light, forming early cloud-rainy weather changes, due to the action of lightning and cosmic rays, amino acids and organic matter molecules are formed in the atmosphere, and then fall into the sea, and finally form early life forms, atmospheric composition improvement, which occurs after the mass reproduction of plants.