They have asked what elements the air has?
Air is a fundamental natural element for the development of life on earth, without it, our planet would be dead and plants, animals and human beings could not exist. The places with purest air are those that have abundant vegetation because they consume carbon dioxide to carry out photosynthesis and help to lower the greenhouse effect. Lichens are bioindicators of air purity, are born and develop on the trunks of trees and rocks.
source
But, do we know what is composed?
Is air composed of chemicals?
source
In the nineteenth century Ramsay and others discovered the presence of rare or noble gases in very small proportions, proving that the air was a mixture of oxygen and nitrogen, later discovered that there was ammonia and carbon dioxide (CO2).
Main elements that make up the air
Now, as each of the clarifications that have been given so far may seem confusing to those who are not close to the chemical elements, a kind of summary can be made as to the main gases that make up the air of the Following way. To be simpler, our air is mainly composed of Nitrogen, Oxygen and Argon. Then we can get to find other gases that are called greenhouse gases that are, water vapor, carbon dioxide, methane, nitrous oxide, ozone, among others.
Fun fact: We breathe 22,000 times a day, drawing in air and expelling dioxide Taking into account the altitude, composition, temperature.
The atmosphere that surrounds the Earth has several layers:
troposphere: It reaches an average height of 12 km, and in it we find, along with the air, dust, smoke and water vapor, among other components.
Stratosphere: It extends from 12 to 50km in height; in its upper layer, it contains a large amount of ozone (O3), of enormous importance for life on earth because it absorbs most of the sun's ultraviolet rays.
Mesosphere: The mesosphere is the third layer of Earth's atmosphere. It extends from 50 to 100 km. The temperature can reach up to -90 ° C. It is 90 ° C. It is the coldest area of the atmosphere. In this layer you can see the shooting stars that are meteorites that disintegrate upon reaching the thermosphere to the thermosphere.
Lonosphere: It starts after 100 km. and can reach 500 km. This layer is constituted by oxygen (02). The temperature reaches more than 1000 ° C; the X and ultraviolet rays of the Sun ionize rarefied air, producing electrically charged atoms and molecules called ions.
Exosphere: It is the last layer of the Earth's atmosphere. Start at 500km. high and extends beyond 1000 km; contains a flow or plasma, which is seen from the outside and which is named after the Van Allen Belts.
Physical Properties
It is of less weight than water.
It is of lower density than water.
It has no defined volume.
It does not exist in a vacuum.
It is a transparent, colorless, odorless and tasteless fluid.
It is a good thermal and electrical insulator.
One (1) liter of air weighs 1.29 grams, under normal conditions.
Chemical properties
It reacts with temperature, condensing on ice at low temperatures and producing drafts.
It is composed of several basic elements for life.
Nitrogen (N2) covers 78%, Oxygen (O2) only 21% and the remaining 1% are: Carbon Dioxide (CO2), Hydrogen (H2), Argon (Ar), Neon (Ne) , Helium (He), Methane (CH4), Krypton (Kr), Hydrogen (H2), Nitrous oxide (N2O), Carbon monoxide (CO), Xenon (Xe), Ozone (O3), Nitrogen dioxide (NO2) , Iodine (I2), Ammonia (NH3). Water Vapor (H2O) is not counted as dry air.
Remember: Air is very important for life and should be used in a healthy way. It is a mixture of gases that has physical and chemical properties. Its main components are nitrogen, oxygen and other elements.