Air Composition
"Aero" meaning air in latin is the name give to the mixture of gases which make up the Earth's atmosphere. The composition, physical, and chemical properties of air are very similar everywhere.
It is useful to think of the air which we encounter every day as being a locally-produced mixture of three types of "ingredients":
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Standard dry air, which is mainly composed of three gases: nitrogen (about 78%), oxygen (about 21%), and argon (about 1%). Together, these three gases make up 99.96% of dry air. All three can be economically recovered as industrial gas products. Standard dry air also contains a small amount of carbon dioxide, and very small amounts of neon, helium, krypton, hydrogen and xenon.
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Water vapor (humidity). The amount of water vapor in air at ground level can vary quite a bit - from almost zero to about 5 percent. Many factors influence the amount of humidity in the air at a given location and time.
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Other constituents (which are usually present in trace amounts) which reflect local condition.
At one glance, the pie chart could only show the rough percentage of the different gases in the atmosphere but it is certainly more convenient to remember the main points
| The sea-level composition of air (in percent by volume at the temperature of 15°C and the pressure of 101325 Pa) is given below in a chart. | ||||
| Nitrogen | N2 | 78.084 % | ||
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| Oxygen | O2 | 20.9476 % | ||
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| Argon | Ar | 0.934 % | ||
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| Carbon Dioxide | CO2 | 0.0314 % | ||
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| Neon | Ne | 0.001818 % | ||
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| Methane | CH4 | 0.0002 % | ||
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| Helium | He | 0.000524 % | ||
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| Krypton | Kr | 0.000114 % | ||
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| Hydrogen | H2 | 0.00005 % | ||
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| Xenon | Xe | 0.0000087 % | ||
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