Short paragraph of composition of air
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atmosphere is composed of molecules of different gases. The most common gases are nitrogen (78%), oxygen (about 21%), and argon (almost 1%). Other molecules are present in the atmosphere as well, but in very small quantities.
While the composition doesn’t change much as you travel up through the lowerlayers of the atmosphere, what does change is the number of molecules. As you travel higher, the air molecules become less plentiful.
Although dominantly the same composition, there is a very important chemical difference within thestratosphere. For it is within this layer that the highest concentrations of ozone molecules reside. In the stratosphere, ozone molecules -- three oxygen atoms bonded together-- prevent some of theSun’s most intense rays from reaching the Earth’s surface. Currently, NCAR scientists and researchers worldwide are monitoring this layer; so thin at the South Pole we call it a “hole” where the molecules are being destroyed.
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While the composition doesn’t change much as you travel up through the lowerlayers of the atmosphere, what does change is the number of molecules. As you travel higher, the air molecules become less plentiful.
Although dominantly the same composition, there is a very important chemical difference within thestratosphere. For it is within this layer that the highest concentrations of ozone molecules reside. In the stratosphere, ozone molecules -- three oxygen atoms bonded together-- prevent some of theSun’s most intense rays from reaching the Earth’s surface. Currently, NCAR scientists and researchers worldwide are monitoring this layer; so thin at the South Pole we call it a “hole” where the molecules are being destroyed.
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Air is a gaseous substance that is composed primarily of nitrogen, oxygen and argon.The air in the atmosphere that surrounds the earth is approximately 78% nitrogen, 21% oxygen, 1% other gases. Water vapour accounts for roughly 0.25% of the atmosphere by mass. Nitrogen and oxygen are two gases which makes up bulk of the atmosphere. It contains dust particles also.
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