JessiccaFact: Air
October 10th 2006 10:02
Air is a mixture of gases comprising the Earth's atmosphere, something that all plants and animals need for life. The mixture contains one group of gases whose concentrations are nearly constant as well as another group whose concentrations vary in space and time.
The atmospheric gases with steady concentrations are nitrogen (78% of the air) and oxygen (21%), followed in order of quantity by argon, neon, helium, methane, krypton, hydrogen, nitrous oxide, and xenon.
Of the gases with variable concentrations, the most important are water vapor, ozone, carbon dioxide, sulfur dioxide, and nitrogen dioxide. There is a "blanket" of air about 400 miles deep surrounding the Earth.
The atmospheric gases with steady concentrations are nitrogen (78% of the air) and oxygen (21%), followed in order of quantity by argon, neon, helium, methane, krypton, hydrogen, nitrous oxide, and xenon.
Of the gases with variable concentrations, the most important are water vapor, ozone, carbon dioxide, sulfur dioxide, and nitrogen dioxide. There is a "blanket" of air about 400 miles deep surrounding the Earth.
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