Posted on March 31, 2010 9:47 am

Air

What is air made of?

Dry air is primarily made up of nitrogen (78.09%) and oxygen (20.95%). The remaining 1% is made up of argon (0.93%), carbon dioxide (0.03%) and other trace gases (0.003%). Water vapor (water in its gaseous state) is also present in air in varying amounts.
Interesting facts:
CARBON DIOXIDE: The amount of carbon dioxide, although small, will double in the next 100 years as more petroleum and coal is burned to fuel societies need for energy. About half of the carbon dioxide produced in this way get absorbed by vegetation, which uses it for “food”.
OXYGEN: While we know that vegetation produces oxygen as part of photosynthesis, the origin of the huge amount of oxygen in the atmosphere is somewhat of a mystery. It is thought to have been produced from chemical reactions in ocean sediments.

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