Air Around Us

1. Internal to Wipro

2. Internal to Wipro
Air can be found all around us. Although we cannot see air, we
may sense its presence in a variety of ways.
• Walking, for example, allows us to sense the presence of air.
• Have you ever considered how a kite flies? It flies because of
the wind, which is moving air.

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1.Air is the gaseous form of matter.
2.Air is colorless and transparent in nature. These are the
reasons why we cannot see air.
3.Air is a form of matter. Therefore, it has mass, and it occupies
space.
4.Air supports the process of burning.

4. Internal to Wipro
1.Nitrogen: It is the most abundant gas in the earth’s
atmosphere. The atmospheric air contains
around 78%78% of nitrogen. It is required by animals and
plants for their growth. The atmospheric nitrogen is also
used for the production of fertilizers. The nitrogen gas will
not support burning; it helps to control the process of
burning.
2.Oxygen: We know that oxygen is called as life-
supporting gas. Our atmospheric air contains
around 21%21% of oxygen. All living things need oxygen.
For example, while respiration, we need oxygen to breathe
in and will use it to produce energy by breaking down the
food. Oxygen is also necessary for the process of burning.
3.Carbon dioxide: Carbon dioxide is an important gas
required for both plants and animals. Plants use carbon
dioxide for the process of photosynthesis. It is also known
as a greenhouse gas that helps to trap heat (greenhouse
effect).

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Troposphere is the lowermost layer
of the earth’s atmosphere. It extends
around 10km10km above sea level.
The troposphere is related to the
weather processes such as
thunderstorms, cloud formation,
rainfall, and snowfall.
Stratosphere is the second layer of the
atmosphere while going upward. It is
around 50km50km from sea level. The ozone
layer that protects us from the harmful
ultraviolet radiations coming from the sun is
present in stratosphere.
Five Layers of Air in Atmosphere
Mesosphere is the third layer of
the earth’s atmosphere as we
move up. From the sea level, it
extends around 80km80km. In
this layer, the burning of
meteorites when they enter into
space takes place here.
Thermosphere is the fourth layer
of the earth’s atmosphere as we
move up. From the sea level, it
extends up to 80−450km. It is the
layer that helps in radio
transmission
Exosphere is the last layer of the
atmosphere as we go up. The
gases such as helium and
hydrogen float here.

6. Internal to Wipro
https://ugc.berkeley.edu/background-content/photosynthesis/

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People have been causing these
biogeochemical cycles to change. When we
cut down forests, make more factories, and
drive more cars that burn fossil fuels, the
way that carbon and nitrogen move around
the Earth changes. These changes add more
greenhouse gases in our atmosphere and this
causes climate change.
https://scied.ucar.edu/learning-zone/earth-
system/biogeochemical-cycles

8. Internal to Wipro
4.Plants and animals use oxygen a lot. However, we never seem to run
out of oxygen. Why is it so? Well, this is because there are some natural processes that helps
to maintain the level of oxygen and carbon dioxide in the atmosphere. These processes are
respiration and photosynthesis. That is, during the process of respiration, we inhale oxygen
and exhale carbon dioxide. Similarly, during the process of photosynthesis, plants take in
carbon dioxide and release out oxygen.
5.Water vapour: Air contains water vapor. The source of water vapor in the air is due to
the phenomenon of transpiration and evaporation.
6.Dust and Smoke: Dust particles are always present in the air. The amount of dust
particles in the air varies from place to place and from time to time. Air also contains smoke.
This is given out by vehicles and factories. Dust and smoke in the air are harmful to our
respiratory system.
6.Besides these gases, the other gases present in the atmosphere are generally called trace
gases.

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