Air is the result of the mixture of gases that are suspended in the Earth's atmosphere and that remain attached to our planet thanks to the force applied by gravity on Earth, this, like water, is essential to sustain life on our planet.
The composition of the air is extremely delicate and the proportions of the elements that make it up can be variable:
- Nitrogen: 78%
- Oxygen: 21%
- Water vapor: varies from 0 to 7%
- Ozone
- Carbon dioxide
- Hydrogen
- Noble gases such as krypton or argon: 1%
The terrestrial atmosphere is composed of air and depending on the temperature and latitude of this, it is divided into four layers; troposphere, stratosphere, mesosphere and thermosphere. The higher the height in which we are in the Earth's atmosphere, the lower the pressure and the weight of the air will be, making breathing impossible as we ascend.
The troposphere and stratosphere are the most studied layers of the atmosphere, because they are the ones that absorb and are most affected by pollution, in addition to being the ones closest to the earth's surface. Likewise, the troposphere is the layer that is responsible for the entire process of respiration of living beings, because it is the layer that has the greatest amount of oxygen necessary for human and animal life.
