Air Around Us: Class 6 Science NCERT Chapter 15

Key Features of NCERT Material for Class 6 Science Chapter 15 –  Air Around Us 

In the previous chapter: Water,  you must have learned about how water is a significant element needed to nourish life on earth. Furthermore, in chapter 15: Air Around Us in Class 6 NCERT Book, you will learn about air and what it is composed of in detail.

Quick revision notes

Wind: When air is moving, it is called wind. 

Air: Air is a blend of various gases. 

Properties of air

  • It is drab i.e., it has no colour and taste. 
  • It’s transparent. Hence, we can see through it. 
  • Air consumes space. It occupies all the space in a holder which is, in any case, vacant and is by all accounts vacant. 
  • Air applies pressure every way. 
  • Every single living being requires air for their endurance since it contains O2 (oxygen gas) and CO2 (carbon dioxide gas) as parts of its blend. 
  • Smoke: These are the dull hued gases brought about by burning of things. 
  • Weathercock: It shows the course wherein the air is moving to that place. 

A weather cock

Composition of Air

  • Air isn’t one substance yet is a blend. 
  • Air is a blend of certain gases, water fume, and residue particles. 
  • The gases noticeable all around are principally nitrogen, oxygen, a limited quantity of carbon dioxide, and some different gases. 

The relative proportion of gases present in air

Water vapours

  • Air contains water fumes. 
  • At the point when air interacts with a cool surface, it gets cooled and haze shows up. 
  • The nearness of water vapour noticeable all around is significant for the water cycle in nature. 

Dust particles

  • Air contains dust particles. 
  • The nearness of residue particles in air differs all around and from time to time. 


  • The segment of air that supports consuming is called oxygen. 
  • Oxygen is vital for the endurance of every single living being. It is required in breathing.
  • The level of oxygen noticeable all around will be around 20.95%. 


  • The significant piece of the air is nitrogen. It owns up four-fifth of the space that air fills (be around 78.11%). 
  • Nitrogen doesn’t bolster consuming. 

Carbon dioxide

  • Carbon dioxide makes up a little part (0.03%) of air around us. 
  • It causes a sentiment of suffocation. 
  • All materials, when they consume devour oxygen and produce carbon dioxide. 
  • It is additionally created alongside water fume during the breath. 
  • Plants need carbon dioxide for photosynthesis and to live. 


  • Our earth is encircled via air as a slim layer. This slender layer is known as the environment
  •  Air stretches out as much as a few kilometres. 
  • The air gets more slender and more slender as we go high up from the outside of the earth. 
  • Air is very dynamic because of the development of air, as for the earth. 
  • The procedures like cloud development, roaring, precipitation and so forth., happen in the climate. Employments of Air 

Uses of Air

  • Air applies power to objects that come in its manner. This property of air is very helpful. 
  • Fun like firkins, pinwheel depends on the power applied via air.

Different types of firkis

  • The air current makes the windmills turn.

drawing of a windmill

  • Compacted air is utilized in feels burnt out on vehicles. 
  • Nitrogen is utilized for a huge scope to produce composts. 
  • Winnowing is conceivable simply because of the air. 
  • Air is additionally valuable for playing a few instruments. 
  • Feathered creatures, bats, and numerous creepy crawlies fly noticeable all around. 
  • We can’t hear the sounds without air. 

Atmosphere: The envelope of air that encompasses the earth is known as the environment. 

Carbon Dioxide: Carbon dioxide is a gas created during the breath. It is likewise delivered on consuming of natural substances. It is utilized by plants for photosynthesis. 

Composition of Air: Air is a blend of nitrogen, oxygen, carbon dioxide, water fume, and a couple of different gases. 

Oxygen:  Oxygen underpins consuming and is important for living beings. 

Nitrogen: It is a significant part of our environment. 

Smoke: These are the dim shaded blend of gases created because of the consumption of anything. 

Windmill:  Windmill is an immense contraption that is turned by the wind. It is utilized to draw water from tube wells and to run flour plants. 

Air is all Around Us

A thick cover of air called the air encompasses our Earth. Air is additionally present in things that appear to be unfilled. Let us locate this out by doing an action. 

Composition Of Air

composition of air by gases

It contains for the most part nitrogen and oxygen. It additionally contains carbon dioxide, respectable gases, water fume, dust particles, and hints of different gases. The arrangement of air appears in Figure 16.1. Let us presently confirm the nearness of certain constituents of air. 

Nitrogen and Oxygen in Air

Air contains about 78% nitrogen and 21% oxygen. Oxygen in air underpins consuming though nitrogen doesn’t. Let us demonstrate this by doing a straightforward action. 

Carbon Dioxide

Air contains about 0.03% of carbon dioxide. Plants and creatures take in oxygen and give out carbon dioxide during the breath. At the point when you consume something, carbon dioxide is additionally created. 

Water Vapour

air contains water vapour

Air contains differing measures of water fume contingent upon the climate of a spot. You have found out about the water cycle. The sun warms up the water in the oceans and seas. This water vanishes and frames water fume. You can check the nearness of water fume in the air by watching wet garments drying on a clothesline (Fig. 16.2). Where does the water from these wet garments vanish? The water from the wet garments structures water fume and blends in with the air.

 Dust and Smoke

Have you seen sunbeams going into a dim room? Have you seen small particles in the beams? These are dust particles. Air contains dust. Air likewise contains smoke discharged from manufacturing plants and vehicles (Fig. 16.3). 

air contains dust and smoke

Air Supports Life

We need air to endure. Air contains oxygen and carbon dioxide helpful to plants and creatures. Plants use carbon dioxide in the air to make their own food by a procedure called photosynthesis. Let us perceive how air underpins life in plants and creatures. 

stomata on the underside of a leaf

In Plants

Plants have little pores called stomata, found on the underside of a leaf (Fig. 16.4). Air containing carbon dioxide and oxygen enters the plant through these openings where it gets utilized in photosynthesis and breath. 

In Animals

All creatures need to breathe, be it a cockroach, a fish, or an elephant. It is only that they utilize various organs and instruments for breath. 

At times, we wrongly utilize the details of breathing and breath conversely. Breathing is a physical demonstration of taking in oxygen and giving out carbon dioxide, while the breath is a synthetic procedure by which glucose in the body separates to give vitality. 

Insects utilize various organs for breathing.

In Aquatic Animals and Plants

Most sea creatures like fish, fledgeling, crab, and shrimp have exceptional organs for breath called gills. Gills support them to breathe in oxygen and breathe out carbon dioxide. Some amphibian creatures like dolphin and whale rise to the top of the water routinely to take in air, since they inhale with the assistance of the lungs. 

Amphibian plants like Hydrilla additionally take in oxygen and break up in water through their stomata. 

Fishes have organs to breath called gills

In Amphibians

Creatures of land and water like a frog, newt, etc need breathing frameworks for both air and water. Crocodile and gator swim through the water with part of their nose over the water surface to inhale effectively through nostrils. 

Frogs can breath both in air and water

In Birds

Feathered creatures have a productive respiratory framework as they need elevated levels of oxygen during flight. Winged creatures have a couple of lungs with air sacs that stay open constantly, so air can without much of a stretch go through them. 

Birds have lungs with air sacs

In Mammals

Most warm-blooded creatures inhale with the assistance of the lungs. 

They breathe in oxygen and breathe out carbon dioxide. 

Oxygen And Carbon Dioxide Balance Present In The Air

The balance of oxygen and carbon dioxide in the climate is kept up through breath in plants and creatures and by photosynthesis in plants. Plants produce oxygen during photosynthesis and use oxygen during the breath. They produce substantially more oxygen during photosynthesis than they expend, during breath This is the way the oxygen devoured by plants and to a huge degree by creatures is recharged noticeable all around through photosynthesis. 

Air Pollution

The expansion of substances in the earth in amounts that are hurtful to live creatures is called contamination. Air is getting contaminated step by step as a result of different human exercises. Consuming of energizes like coal and oil, exorbitant consuming of powers like wood, smoke, and destructive gases discharged from businesses (Fig. 16.5), smoke discharged by vehicles (Fig. 16.6), and machines discharging gases are the significant reasons for air contamination. These gases spread and blend noticeable all around and ruin the nature of air, in this way making it unclean. 

Industrial And vehicular pollution

Air contamination has major unfavourable consequences for plants, creatures just as people. Hurtful gases present in the contaminated air make breathing troublesome. Air contamination additionally prompts a ton of lung malady like asthma and lung malignant growth. Air contamination likewise harms crops. 

In the event that we don’t begin caring for the nature of air around us, the oxygen and carbon dioxide levels will never again be adjusted and living creatures will be the ones getting influenced. 

There are various ways by which we can lessen air contamination. Some of them are: planting an ever-increasing number of trees, reusing plastics, customary checking of vehicles for the discharge of hurtful gases, and so on. 


A thick cover of air Pollution The expansion of substances in the encompassing the Earth’s surface is known as the earth in amounts that are the hurtful air. to living creatures is called contamination. 

Every living being needs air to endure. Air can’t be seen however can be felt when it moves. 

Air is a blend of a few gases. 

Oxygen is required for breath. Carbon dioxide is given out as a result of breath. 

Bugs take in air with the assistance of small gaps in their bodies called spiracles; the nightcrawler inhales through their skin, which is kept damp with the assistance of a substance called bodily fluid. 

Some sea-going creatures like whale and dolphins just as well evolved creatures inhale with the assistance of lungs. 

Creatures of land and water like frog inhale with the assistance of lungs, when ashore. In water, these creatures inhale with the assistance of their damp skin. 

Feathered creatures inhale through lungs and air sacs that are open constantly. 

There are a few reasons for air contamination: over the top consuming of fills like wood, coal, and oil, machines discharging gases, vehicles discharging smoke, and a few sorts of unsafe gases discharged by enterprises.


The next chapter of class 6 NCERT Book: Garbage In, Garbage you will learn about waste products and garbage in households and other places on a daily basis and where they go.

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