What is the ozone layer?
Our atmosphere contains 21% oxygen. The oxygen present in the atmosphere is molecular oxygen (O2) that is composed of two oxygen atoms. When ultraviolet radiation from the sun enters the atmosphere, it breaks the oxygen molecules into two apart oxygen atoms. The oxygen atom is quickly reactive. Therefore, it instantly reacts with oxygen molecules and makes the ozone gas. This process continuously occurs in the presence of ultraviolet waves. As a result, the ozone layer is formed. The ozone layer is covered the whole earth.
The ozone gas is very poisonous. However, it does not present on the surface of the earth.
The thickness of the ozone layer
The thickness of the ozone layer is measured in ‘Dobson unit’. One Dobson unit means the thickness is 0.01 mm at STP (Standard Temperature and Pressure). The ozone layer’s average thickness is 300 dobson unit that means ozone layer is 3 mm thick. You might think that this is a very thin layer.
The thickness or concentration of the ozone layer varies in between 15–30 km. The 90 % of the ozone layer found in 30-35 km range above the ground. At this height our stratosphere is present. This s the region where ozone layer most dense. The 10% part of the ozone layer is present in the top of the troposphere where the ozone layer works as a greenhouse gas.
Importance of the ozone layer
It Protects human, vegetation, and animals from the dangerous ultraviolet portion of the Sun’s rays. Although the ozone layer is thin in the atmosphere, it is still of great importance to us. As it absorbs harmful ultraviolet radiation from the Sun and does not allow to reach the earth’s surface.
Ultraviolet radiation is very harmful not only to humans but also to trees, plants, and animals. it can cause cancer and many dangerous diseases in organisms.