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The air around us forms the atmosphere of the earth. It extends from the ground to about 11 km into space. It gets denser due to gravity as we approach the ground. It has the right amount of pressure and composition to sustain life. The atmosphere above the earth’s surface forms a blanket of gases, protecting us from many harmful radiations that come from outer space. This part of the atmosphere is called the ozone layer. Why is Air Important? Air is a mixture of various gases found in the Earth’s atmosphere. Usually, the air is colourless, odourless and tasteless. It consists of about 78% nitrogen, 21% oxygen, 0.9% argon, 0.04% carbon dioxide, and trace amounts of other gases. Air plays a vital role in the existence of life on earth. The three essential roles of air are as follows: Air for Breathing Air for Combustion Air for Regulating Temperature Air for Breathing  Air contains two essential components: Oxygen and Carbon dioxide, which makes life possible. Oxygen is required by plants and animals to convert the chemical energy stored in food into energy that they can use for various metabolic processes. During the process of respiration, oxygen in the air reacts with molecules from food to produce energy. In the process, carbon dioxide is released. Plants consume carbon dioxide. During the day time or in the presence of sunlight, all green plants convert light energy into chemical energy. In this process, plants convert the carbon dioxide molecule into glucose (food) molecules, and oxygen is released as a byproduct. This process is known as photosynthesis. Thus, we need air to gain energy from food and plants need it to store energy in the form of food. This balance sustains all life on earth. Air for Combustion  What is Combustion? Combustion is a chemical process in which, the fuel combines with oxygen gas to release energy in the form of heat and light. This heat can be used to produce electricity, run our cars and also for cooking. During combustion, oxygen in the atmosphere combines with the carbon atoms to produce carbon dioxide and hydrogen atoms to produce water. In fact, without oxygen, one cannot use these fuels for our daily needs. However, too much oxygen can cause uncontrolled burning and explosions. Even the tiniest spark can set off fires. However, this does not happen because of the presence of nitrogen gas in the atmosphere. Nitrogen does not support combustion and thus prevents the excess reactivity of oxygen. Thus, these two components are essential to ensure that energy from the fuel can be used in a controlled manner. Air for Regulating Temperatures Upon heating, the density of air reduces, and it rises upwards. Similarly, cold air is denser than the hot air which sinks towards the ground. As the hot air rises, it creates a space of low pressure where the cold air rushes in and occupy this space. Winds are formed due to this phenomenon. As the temperature of air increases, it raises up. The colder air from the surroundings enters into it, get heated up, and the cycle repeats. The rising of the hot air transfers its heat into outer space and sinks back down. In this way, heat is transferred from hotter regions to colder regions. This is known as temperature regulation, and the process of transferring heat is called convection. Without the atmosphere, the daytime temperatures on earth would be extremely high and night time temperatures would dip below freezing. Thus, the air (through the greenhouse effect) would act like a blanket, providing a layer of insulation for life on earth. Other natural resources like water, land, rivers, and mountains play a key role in sustaining life on earth by providing a sustainable environment for life. Essentially, life cannot survive without these vital components. To learn more about nature, the air, different components of nature required for sustaining life on earth, register at BYJU’S. Frequently Asked Questions 1. Is breathing combustion? From a biological perspective, breathing resembles combustion, where chemical bonds are broken down and oxygen is used up; which then produces carbon dioxide. 2. Is air needed for life? One of the most integral components of air is oxygen, which is important for all life on earth. However, certain microorganisms can survive without this element. These organisms are called anaerobes. 3. Which gas is essential for burning and breathing? Oxygen is crucial for burning and combustion. It is also important for breathing. 4. What is the scientific name for air? Technically, “air” does not have a scientific name as it is a mixture of substances. Chemical names can be given to “pure” substances such as water (H20) and oxygen (O2). 5. Why is air called the “breath of life?” Air contains oxygen, which is the most important element for all life on earth. More to Read: Biotic And Abiotic Factors    Learn Better through BYJU'S Quiz  Put your understanding of this concept to test by answering a few MCQs. Click ‘Start Quiz’ to begin! Select the correct answer and click on the “Finish” button Check your score and answers at the end of the quiz Start Quiz BIOLOGY Related LinksOzone Layer DefinitionPeristalsis MeaningWhat Is a HeterotrophMonocot StemProkaryotic MeaningWhat Is SpinningEchinodermata ExamplesHuman Anatomy and PhysiologySolanaceae FamilyNervous Tissue Diagram   CBSE Sample Papers CBSE Sample Papers Class 8 Science CBSE Sample Papers Class 9 Science CBSE Sample Papers Class 10 Science CBSE Sample Papers Class 11 Physics CBSE Sample Papers Class 11 Chemistry CBSE Sample Papers Class 11 Biology CBSE Sample Papers Class 12 Physics CBSE Sample Papers Class 12 Chemistry CBSE Sample Papers Class 12 Biology CBSE Previous Year Question Papers CBSE Previous Year Question Papers Class 10 Science CBSE Previous Year Question Papers Class 12 Physics CBSE Previous Year Question Papers Class 12 Chemistry CBSE Previous Year Question Papers Class 12 Biology ICSE Sample Papers ICSE Sample Papers Class 8 Physics ICSE Sample Papers Class 8 Chemistry ICSE Sample Papers Class 8 Biology ICSE Sample Papers Class 9 Physics ICSE Sample Papers Class 9 Chemistry ICSE Sample Papers Class 9 Biology ICSE Sample Papers Class 10 Physics ICSE Sample Papers Class 10 Chemistry ICSE Sample Papers Class 10 Biology ISC Sample Papers Class 11 Physics ISC Sample Papers Class 11 Chemistry ISC Sample Papers Class 11 Biology ISC Sample Papers Class 12 Physics ISC Sample Papers Class 12 Chemistry ISC Sample Papers Class 12 Biology ICSE Previous Year Question Papers ICSE Previous Year Question Papers Class 10 Physics ICSE Previous Year Question Papers Class 10 Chemistry ICSE Previous Year Question Papers Class 10 Maths ISC Previous Year Question Papers class 12 ISC Previous Year Question Papers Class 12 Physics ISC Previous Year Question Papers Class 12 Chemistry ISC Previous Year Question Papers Class 12 Biology Join BYJU'S Learning Program   Grade/Exam Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 Class 8  Class 9 Class 10 Class 11 Class 12 IAS CAT Bank Exam GATE  Submit Leave a Comment Your Mobile number and Email id will not be published. Required fields are marked * * Send OTP * Post Comment COURSES CBSE ICSE CAT IAS JEE NEET Commerce JEE Main NCERT JEE Advanced CBSE Sample Papers CBSE Question Papers EXAMS CAT Exam GATE Exam IAS Exam UPSC Syllabus UPSC 2021 Bank Exam Government Exams CLASSES Class 1st - 3rd Class 4th - 5th Class 6th - 10th Class 11th - 12th EXAM PREPARATION Free CAT Prep Free IAS Prep Maths Physics Chemistry Biology RESOURCES Blog Videos All Products DSSL COMPANY About Us Contact Us Investors Careers BYJU'S in Media Students Stories - The Learning Tree Faces of BYJU'S – Life at BYJU'S Social Initiative - Education for All BYJU'S APP FAQ Support FREE TEXTBOOK SOLUTIONS NCERT Solutions NCERT Exemplar NCERT Solutions for Class 6 NCERT Solutions for Class 7 NCERT Solutions for Class 8 NCERT Solutions for Class 9 NCERT Solutions for Class 10 NCERT Solutions for Class 11 NCERT Solutions for Class 12 RD Sharma Solutions RS Aggarwal Solutions ICSE Selina Solutions STATE BOARDS Maharashtra Gujarat Tamil Nadu Karnataka Kerala Andhra Pradesh Telangana Uttar Pradesh Bihar Rajasthan Madhya Pradesh West Bengal FOLLOW US   Disclaimer   Privacy Policy   Terms of Services   Sitemap © 2021, BYJU'S. All rights reserved.     BOOK Free Class
  • 2 answers
What is your class
What is this
  • 1 answers

Sia 🤖 1 month, 4 weeks ago

comment allez-vous
  • 0 answers
  • 2 answers

Divyanshu Raj 1 week, 2 days ago

Same as english with different pronunciation

Ankur Kumar 2 months, 1 week ago

Means
  • 2 answers

Janvi Chum 1 month, 1 week ago

Je t'aime = I like you

Arjun Lochen 2 months, 1 week ago

It means "I love/like you"
  • 5 answers

Janvi Chum 1 month, 1 week ago

bonjour or bon matin

Bhavesh Mavkar 3 months ago

Bonjour

Paarvi Parashar 3 months, 1 week ago

Bonjour Bon matin

Jissa Mariam John 3 months, 2 weeks ago

Bonjour

Dark Gamer 3 months, 3 weeks ago

Bonjour
  • 4 answers

Sia 🤖 3 months, 3 weeks ago

bonne soirée

Janvi Chum 1 month, 1 week ago

bon soir!

Paarvi Parashar 3 months, 1 week ago

Bonsoir!

Dark Gamer 3 months, 3 weeks ago

Bonne soirée
  • 4 answers

Dark Gamer 3 months, 3 weeks ago

Momentos

Hansika Baghel 4 months ago

I dont know much but i know a little or u can learn french with the help of the app "doulingo" it is very very great app its very easy to learn any language from this app.😁 If it helps u please thanks my answer.✌🤭😁

Sachin Yadav 4 months, 1 week ago

Je m' appelle Akansha with answer

Gurbir Singh 4 months, 1 week ago

Yes
  • 1 answers

Dark Gamer 3 months, 3 weeks ago

You are Veronique. Write a postcard to your parents who are in Bordeaux telling them what you are doing in Delhi
  • 5 answers

Divyansh Pandey 5 months ago

To go-allez

Divyansh Pandey 5 months ago

To go noob

Sampritha Joy 5 months, 2 weeks ago

To go

Lima Mathew 6 months ago

To go -Aller

Ruhani Gupta 6 months, 1 week ago

Let me know asap!!!
  • 5 answers

Mehvish Shamayra 4 months, 1 week ago

Bonjour

Dhairya Sharma 4 months, 2 weeks ago

Salut

Lima Mathew 6 months ago

Bonjour, Salut

Vansh Purswani 6 months, 1 week ago

Bonjour 🙏

Akshiii 😎🤞 6 months, 1 week ago

Bonjour
  • 1 answers

Paarvi Parashar 3 months, 1 week ago

Hello!! By the way, this is the question of history.. But still here is Ur answer dude!! The Social, economic and political conditions in Russia before 1905 was backward: Social Conditions: 85% of Russia's population was agriculturist. The industries were there, but rarely they were privately owned. Workers were divided on the basis of their occupation. They mainly migrated to cities for employment in factories. The peasant community was deeply religious but did not care much about the nobility. They believed that land must be divided amongst themselves. Economic Condition: Russia was going through a bad period economically. Prices of essential good rise while real wages decreased by 20% leading to the famous St. Petersburg strike. This strike started a series of events that are together known as the 1905 Revolution. During this revolution, there were strikes all over the country, universities closed down, and various professionals and workers established the Union of Unions, demanding the establishment of a constituent assembly. Political Condition: Political parties were illegal before 1914. The Russian Social Democratic Workers Party was founded in 1898 by socialists who respected Marx’s ideas. In 1903, this party was divided into two groups - Mensheviks and Bolsheviks. The Bolsheviks, who were in majority, were led by Lenin who is regarded as the greatest thinker on socialism after Marx. Hope it will help you!!😃😃😃
  • 5 answers

Paarvi Parashar 3 months, 1 week ago

It means 'the' which a definite article in French... It is a feminine definite article 'Le' is the masculine Hope it will help you!!😃😃😃

Hansika Baghel 4 months ago

The

Vaishnavi Wakchaure 4 months, 1 week ago

The

Sumitti Gugnani 6 months, 3 weeks ago

'The ' used with feminine nouns

Abhidha Pandey 6 months, 3 weeks ago

The
  • 2 answers

Paarvi Parashar 3 months, 1 week ago

Vous means 'you' It is used as a plural you or the formal you... Whereas tu is the singular or informal you... Hope it will help you!!😃😃😃

Abhidha Pandey 6 months, 3 weeks ago

Means you
  • 2 answers

Dark Gamer 3 months, 3 weeks ago

Replace underlined words with possessive pronouns

Lima Mathew 6 months ago

Replace words using possessive pronouns
  • 0 answers
  • 2 answers

Divyansh Pandey 5 months ago

How to say Hey i am also pandey in french

Abhidha Pandey 6 months, 3 weeks ago

Je suis Bts armeè
  • 2 answers

Paarvi Parashar 3 months, 1 week ago

Fiati Elvis Enseignant à Ho Dome E.P JHS P.O. Box HP 23, Ho Mon cher Donald, J'ai le plaisir de t'écrire cette lettre pour te décrire ma ville natale. Je pense que tout va bien à New York. Et tes parents, je pense qu'ils se portent bien. Ma ville natale s'appelle Ho. Ho se trouve dans la région de Volta au Ghana. Elle est la capitale et la ville administratif de la région. Nous parlons I 'Ewe comme notre dialecte mais la langue officielle est l'anglais. Selon l'histoire de nos ancêtres, nous venons de Notse dans la république du Togo et nous sommes exilés ici à cause de la tyrannie du roi Agorkorli. Nous fêtons la fête de I 'igname chaque septembre pour remercier nos ancêtres pour une bonne recolte. Ho est une ville propre et calme admirée par beaucoup de tourristes à cause de sa nature montagneuse. On possède des écoles, des hopitaux et presque toutes les infrastructures sociales nécessaires dans une ville. Je sais que tu n'aimerais plus repartir à New York après avoir jouir de la sérénité de Ho. Pour cela, je t'invite à visiter Ho l'année prochaine. Je te souhaite bien de choses et j'espère te lire très bientôt. Ton ami sincère, Elvis Fiati.

Pankajkumar Tatar 7 months, 2 weeks ago

idk
  • 2 answers
You are in Senegal to study. Write a postcard to your friend yes 😷🙏

Dark Gamer 3 months, 3 weeks ago

You are in Senegal to study. Write a postcard to your friend
  • 3 answers

Vamsee Sreeram Vavilala 6 months, 3 weeks ago

We can say "Comment ça va?" if we are speaking to our friends or someone informal or younger than age. But while speaking to elders or respected people or to our parents, we must ask "Comment-t-allez vous?"

Sumitti Gugnani 6 months, 3 weeks ago

We can also say comment ça va

Shreya Pawar 7 months, 3 weeks ago

How are you in french is said as 'Comment allez-vous?'
  • 1 answers

Navya Singh 7 months, 3 weeks ago

It's sames as direct and indirect object
  • 5 answers

Navya Singh 7 months, 3 weeks ago

Bonjour

Pankajkumar Tatar 7 months, 4 weeks ago

Janu Mericpour

R Aishwarya 7 months, 4 weeks ago

Merci
Thanx

Bhawana Joshi 8 months ago

Bonjour
  • 3 answers

Paarvi Parashar 3 months, 1 week ago

According to me, U r trying to say Comment ça-va ? Because its pronounciation is kamasawa... If yes, u r saying this then It means How are you ? In informal way 😊 hope u liked it !! 😃😃😃

Saurabh Yadav 8 months, 1 week ago

I know

Vansh Rajput 8 months, 3 weeks ago

I don't know
  • 1 answers

Paarvi Parashar 3 months, 1 week ago

By the way, it is the question of history... But here is Ur answer dude!! King Louis and his queen, Mary-Antoinette, were imprisoned in August 1792, and in September the monarchy was abolished. ... In January 1793, Louis was convicted and condemned to death by a narrow majority. On January 21, he walked steadfastly to the guillotine and was executed. Hope you will understand it !! 😁😁😄😄
  • 3 answers

Paarvi Parashar 3 months, 1 week ago

This is a informal letter. It's for the sake of Ur help... Hope you will get it !!😄😄😃😃 Fiati Elvis Enseignant à Ho Dome E.P JHS P.O. Box HP 23, Ho Mon cher Donald, J'ai le plaisir de t'écrire cette lettre pour te décrire ma ville natale. Je pense que tout va bien à New York. Et tes parents, je pense qu'ils se portent bien. Ma ville natale s'appelle Ho. Ho se trouve dans la région de Volta au Ghana. Elle est la capitale et la ville administratif de la région. Nous parlons I 'Ewe comme notre dialecte mais la langue officielle est l'anglais. Selon l'histoire de nos ancêtres, nous venons de Notse dans la république du Togo et nous sommes exilés ici à cause de la tyrannie du roi Agorkorli. Nous fêtons la fête de I 'igname chaque septembre pour remercier nos ancêtres pour une bonne recolte. Ho est une ville propre et calme admirée par beaucoup de tourristes à cause de sa nature montagneuse. On possède des écoles, des hopitaux et presque toutes les infrastructures sociales nécessaires dans une ville. Je sais que tu n'aimerais plus repartir à New York après avoir jouir de la sérénité de Ho. Pour cela, je t'invite à visiter Ho l'année prochaine. Je te souhaite bien de choses et j'espère te lire très bientôt. Ton ami sincère, Elvis Fiati.

Anjali Kurhade 9 months, 2 weeks ago

Hi

Sukanya Epuri 9 months, 2 weeks ago

Hi whatsup
  • 1 answers

Dark Gamer 3 months, 3 weeks ago

Des moments

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