Layers of Atmosphere and Importance of Air

What is Air and Atmosphere?

Air is the constant pressure of gases, that we feel all around us but cannot see. Atmosphere, on the other hand, is the layer of gases all around the surface held by the gravitational force of the earth. Thus, air can be said to be a component of the atmospheric conditions and atmospheric pressure indicating that air and atmosphere are very closely related. The difference between air and atmosphere is the physical characteristic such as air being a pressure of gases and atmosphere being a mixture of gases. The oxygen gas which is responsible for all the living creatures on earth underlines the importance of air for a living being. The importance of the atmosphere around Earth can be characterized by the possibility of life on earth in the current state which would not have been possible with the meteorite event and sun rays from the sun.

Importance of Atmosphere and the Atmospheric Layers

From the introduction, it is clear that the atmosphere is a mixture of gases presents around the surface of the earth due to its gravitational attraction. This mixture of gases can be divided into different layers depending on various factors. So, what are the five layers of the atmosphere? They are the following from top to bottom (near the surface): Exosphere, Thermosphere, Mesosphere, Stratosphere and Troposphere. These five different layers provide protection and also make life possible because of the constituent gases which state the significance and importance of the atmosphere. The five layers provide a wide range of distribution of gases and the densities of the gases at each layer of the atmosphere. 

The five layers of the atmosphere and their composition and properties are explained below:


The exosphere is the outermost layer of the atmosphere. Its limits reach from around 700 km to 10,000 km from the surface of the earth. There is not much definite boundary between the vaccum of space and the exosphere, as the air gets thinner and thinner moving away from the surface of the Earth. It mostly consists of a few particles that move to and from space.


It is the layer of the atmosphere ranging from 100 km to 700 km limit of the atmosphere. It begins at the Karman line and is the space where the space shuttles mostly revolve around the Earth. Even though the temperatures are high, the heat is not felt because of the low atmospheric pressure. The International Space Station also orbits around the Earth in this region.


This is the densest layer of atmosphere amongst the top three layers. Because of this density, this layer is responsible for the burning of the meteors and other objects falling from space due to the gravitational force of the Earth. Also, there is a temperature drop in this layer with temperatures reaching -110° C. The layer between the mesosphere and the stratosphere known as the mesopause is the coldest place on Earth. It expands from 50 km to 90 km above the earth’s surface.


This layer of atmosphere is right above the troposphere and is without any or much water vapour. This layer also consists of the ozone layer which is filled with ozone (O3) gas. As is well-known the main function of the ozone layer is to protect the earth from the harmful ultraviolet rays of the Sun. It ranges from 30 to 50 km above the surface of the earth.


This is the last layer and the closest layer to the surface of the Earth. This layer reaches up to 39 km from the surface of the earth. It is the densest layer and is filled with many different gases. The most abundant gas is Nitrogen which comprises 78% of the component and Oxygen 21% with other gases taking up 0.9% argon and 0.04% carbon dioxide with small traces of other gases. 

The above-mentioned earth air layers also show the importance of the atmosphere in the protection of the earth and their contribution to the possibility of life on Earth. The distribution of the layers of the atmosphere is given below in the diagram:



Importance of Air

Air is the fundamental building block without which life would cease to exist as it is. All the organisms require oxygen present in the air for respiration and generating energy. It is utilised for the generation of energy by metabolism by the cells. The nitrogen is also utilised by the nitrogen-fixing bacteria for the growth of plants in a symbiotic relationship with the plants. The importance of air is also signified as it is responsible for many phenomena such as the scattering of light and the travelling of sound. 

As per the definition of Air, the pressure is because of the density of various gases present in the atmosphere. The pressure differences between different places lead to an increase in the flow of air and it is known as wind. The pressure difference is also a phenomenon of air and atmosphere which is responsible for rainfall.



The given article briefly explains the difference between air and atmosphere and their definitions. It also underlines the importance of air and the importance of the atmosphere. Thus, it can be concluded that without air and atmosphere life as we know it wouldn't have been possible on Earth. This is one of the most important differences between Earth and other planets for the existence of living organisms.

Layers of Atmosphere and Importance of Air

You must have gone through the above-mentioned notes and got an overview of the layers of atmosphere and the importance of air. Both the topics are very important and considered to be the foundational topics, you need to understand these topics very well as they play a vital role in the higher classes. 

You shall have gone through all of it and have an understanding of the topic. If you still have some doubts or you want more material, you may download the Vedantu Learning App which provides you with detailed study notes and live classes that will guide you and help you crack all your exams. 

Since this subject is challenging, students must note that with proper guidance and required efforts, nothing is unattainable. 

When you start claiming your inner powers and start using them to strengthen the core belief, you start winning. Understanding that challenges will be everywhere you go but they don’t have to stop you, rather they will help you to grow. Always have the courage to see the end of the tunnel and that's where your success begins. 

Let's begin to understand some of the tips that can help the students prepare for the subject with ease.


Practice, Practice and Practice! 

If you want to memorize things for a longer period, two things which you should keep in mind while preparing are to understand the concepts and practice them time and again. Practice makes you learn things effectively and efficiently. You should keep practising the topics and that too with breaks. You should never study at a stretch, your mind gets exhausted after a certain point of time and you shall be able to respect the fact that it deserves to get that.


Don't re-read the Books Again and Again

It is one of the most common study techniques that students follow while preparing for exams. Give practice more important than reading the books again. Re-reading the text over and over again is nothing but just superficial. You should read once and then focus on trying it yourself and not just cram the bookish language. It is because cramming might help you pass the exam, but when you consider the fact of how much knowledge you have gained, you will lag.


Test Yourself

Students after completing their revision think that they are done with their preparation, but this is wrong. Another very important part that is yet to be done is to test your knowledge and solve mock tests. The most efficient way to understand things better is to explain them to someone else, if you can do so then you are all ready to jump into the exam. Quizzing yourself is another useful tip that you shall be doing to test your knowledge. 

Use Examples

Learning, understanding and memorizing the concepts may be difficult for the students but it may turn around and become easy. This can be done with the help of examples. If you have a realistic and basic daily use example in your mind, you may ace the topic and that too very easily. For example, if you try to learn that sour foods contain acids it may be difficult to remember but if you memorize them through vinegar or even through lemon it may set in your mind forever. You just need to understand and connect things and everything is sorted.


Use Pictures

Visual representation is one of the oldest methods and is also very effective. It includes graphs, charts, flowcharts, diagrams and much more. You must have noticed that diagrams are easier to understand than the text written with them. These pictures can boost up your memory and also make you understand things better. It is because the human mind might forget the text but a replica of pictures and colours are created in the subconscious mind.

FAQs (Frequently Asked Questions)

1. How Does Air Help Us in Daily Life?

Air is the primary requirement of all the living organisms on Earth. The oxygen present in the air is the most important element and supplier of energy for living organisms. Cellular respiration utilizes oxygen for the metabolic process and produces energy in the form of ATPs (Adenosine TriPhosphates) to carry out life processes.

2. What are the Uses of Atmosphere?

Atmosphere is the mixture of all the gases presents around the surface of the Earth because of its gravity. There are 5 different layers of the atmosphere which are: Exosphere, Thermosphere, Mesosphere, Stratosphere and Troposphere. All five layers have essential functions that contribute to the development of life on earth. For example, the ozone layer in the stratosphere stops the harmful ultraviolet rays from reaching the earth and the mesosphere is responsible for the burning of the meteors and other heavenly objects falling from space. 

3. How many Layers of the Atmosphere are there?

There are five layers of atmosphere namely Exosphere, Thermosphere, Mesosphere, Stratosphere and Troposphere. To know more about them in detail, you shall visit the website of Vedantu or download the Vedantu learning App.

4. My board exam is approaching, I want some Sample Papers through which I can test my knowledge. Can I get it? 

Certainly! You can get all the material that you need for your preparation on the Vedantu website, if you wish to get detailed study notes and mock tests, you can register yourself with them and get access to all of it.

5. I am preparing for my Entrance Exam and I need some guidance from teachers. Can they help me?

Yes, sure! Vedantu offers you the best educators who are highly qualified and are masters in helping the students accelerate their caterers. You can connect with them after enrolling yourself on their website.