Do you know what is atmosphere?
Earth is the only planet out of the 8 planets of the Solar System where life
has been found in the search till now. The main reason for this is the oxygen,
which is considered to be the vital air for organisms is present in the Earth's
atmosphere. Earth is the only planet whose bioactive environment is
favorable. Evidence of life on the rest of the planets has not yet been found by
scientific discovery.
It is not that other planets do
not have an atmosphere. According to scientific discovery, other planets of the
solar systems also have an atmosphere. But the atmosphere there is not
compatible with the Earth's atmosphere. Right now, research is being
done by scientists on the planet Mars. Because the atmosphere of Mars
resembles that of Earth
What is atmosphere of Earth? |
According to scientists, the fact found on Mars so far suggests that there is the most possibility of life and water on Mars. It is necessary for humans and other organisms to have water along with oxygen in the atmosphere. In this article, we will try to tell you what is atmosphere and why it is important for life. As well as, we will discuss the existing gases in the atmosphere of the Earth, the layers of atmosphere, etc. So let's first know what is atmosphere?
What is atmosphere?
The thick layer of air around the
earth is called the atmosphere. Earth is divided into the atmosphere,
lithosphere, and hydrosphere. In which the atmosphere is made of air, the
lithosphere is made of solids, and the hydrosphere is made of water. There is no
definite measure of how far the atmosphere extends, but it is certain that it
is spread over several hundred miles around the earth.
Air is very important for the
survival of animals and plants. It also has a profound effect on the weathering
of the Earth's surface. Many types of physical and chemical activities
are performed due to the air of the atmosphere. Many views of the atmosphere,
such as rainbow, lightning and whirling, north polar light, south polar light,
halo, etc. are produced by light or electricity.
The density of the atmosphere
is not the same. As the altitude rises above the surface of the Earth, the
density of the atmosphere also decreases. The difference in temperature
also causes a difference in the density of the atmosphere. Air pressure at sea
level is equal to the pressure of a column of 760 millimeters of mercury.
Earth is warmed by the sun's small
radiation energy. The radiation of long-lived physical energy from the Earth is
absorbed into the atmosphere. Due to this, the temperature of the atmosphere
remains between 68 ° C to 55 ° C. Ultraviolet light above 100 km converts
oxygen molecules into ions and atoms into electrons. This is why this layer of
atmosphere is called the ionosphere. At night, these ions or electrons then
merge together into a molecule or atom, causing green and red lines to appear
in the night light.
See Also: What is Climate change?
Atmosphere structure and composition
Gas |
Percent volume |
Nitrogen |
78.09 |
Oxygen |
20.95 |
Argon |
0.93 |
Carbon Dioxide |
0.03 |
Neon |
0.0018 |
0.001 |
|
Helium |
0.000524 |
Krypton |
0.0001 |
Xenon |
0.000008 |
Ozone |
0.000001 |
Methane |
Small amount |
Earth’s Atmospheric layers
The Earth's atmosphere is
divided into 5 layers based on density, altitude, and temperature. They are
as follows:
Troposphere
The lowest layer of the
atmosphere is the troposphere. This region is most important for the biosphere
ecosystem as all weather related events occur in it. The air temperature
decreases at an average rate of 1 ° C per 165 m elevation. This is called the
normal heat collapse rate.
Its height is 8 to 10 km at the
pole and about 18 to 20 km at the equator. This layer consists of nitrogen,
oxygen, carbon dioxide, water vapor, and dust particles. It is estimated that
about 95% of the Earth's atmosphere is in the troposphere. The topmost layer of
the troposphere is called the Tropopause.
Stratosphere
Above the troposphere of the
Earth, is the stratosphere. This layer is about 20 to 50 km
above the Earth's surface. Ozone, nitrogen, oxygen, etc. are the main gases in
this layer. Ozone gas is found in the stratosphere for about 30 to 60 kilometers.
The topmost layer of the stratosphere is called Stratopause.
As the height of this layer
increases, the temperature increases. This sequence continues until the Stratopause.
Since there is negligible humidity at this level, clouds form less. Especially
in this layer, the formation of the ozone layer in the presence of ultraviolet
radiation from 20 to 30 km continues. Hence this layer is
also called ozonosphere. This layer absorbs 99% of
ultraviolet solar radiation. As a result, harmful radiation does not reach the
Earth. This creates an environment conducive to the survival of animals and
plants on Earth.
Mesosphere
The atmospheric layer above the
stratosphere is called the Mesosphere. This layer is about 50 to 80 km
above the Earth's surface. At this level, the air layer becomes thinner. The
temperature decreases at this level as altitude increases. This is the coldest
layer.
Hot gas lines emanating from the
meteor appear at this level. The topmost layer of the Mesosphere is called the Mesopause.
Strong winds blow at this layer. Such winds flow from west to east in winter
and from east to west during the rainy season.
Thermosphere
The atmospheric layer above the
Mesosphere is called the Thermosphere. This layer is about 80 to 720 km above
the Earth's surface. At this level, the air layer is thinner and the air is
less. As the effect of solar radiation is more at this level, the temperature
also increases as the height increases.
At the bottom of this layer,
molecules of nitrogen, oxygen, etc. break down into atoms, while in the upper part;
it consists mainly of helium and hydrogen. This is called the ionosphere
because at this stage the gas molecules transform into ions. The topmost layer
of this layer is called Thermopause.
Exosphere
The atmospheric layer above the
thermosphere is called the Exosphere. This layer is about 720 km above the
Earth's surface. This layer is also called the boundary zone. It is the
topmost layer of the Earth's atmosphere.
At this layer, even though the
air is negligible, air molecules and atoms move very rapidly. These molecules
and atoms are so fast that they cannot be affected by the gravitational pull
of the Earth. Molecules and atoms that are free from gravity fly into space.
See Also: What is Global Warming?
Atmospheric humidity
The amount of invisible water
vapor present in the atmosphere is called atmospheric humidity. This humidity
reaches the atmosphere by various forms of evaporation from the earth. Humidity
is of paramount importance in climatology because various forms of
precipitation, atmospheric storms, and cyclones, etc. are based on this.
Atmospheric humidity depends on
the water vapor present in the air. This water vapor remains in the lower
levels of the atmosphere. Its quantity is not the same in all places and
always. There are differences in time and place. This water vapor is formed by
the evaporation of water of river, pond, lake, ocean, etc.
Atmospheric pressure
Atmospheric pressure is the force
exerted on a unit area of a surface in the Earth's atmosphere by the weight of
air above it. In most circumstances, the approximate atmospheric pressure is
estimated by the weight of the air above it at the measurement point.
Low-pressure areas have a lower atmospheric mass above those locations, while
high-pressure areas have a higher atmospheric mass above those locations.
Similarly, as the altitude increases, the atmospheric mass decreases above that
level, so the pressure decreases with increasing altitude. The atmospheric
pressure at sea level is equal to the pressure of 760 mmHg. The air pressure
measuring unit is millibar. The average atmospheric pressure at the seabed is
1013.25 millibar (MB).
Conclusion: The atmosphere is very important to maintain
life on Earth, so we will have to maintain the balance of the atmosphere for
balancing the ecosystem.
In the end
In today's post, you have learned
what is atmosphere, as well as the structure of atmosphere, Earth’s Atmospheric
layers, atmospheric pressure, etc. Hope you all like this article.
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