Gourt > Science > Technology > Mechanical Engineering > Propulsion > Aerospace > Air
Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen, trace amounts of other gases, and water vapor. This mixture of gases is commonly known as air. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation and reducing temperature extremes between day and night.
The atmosphere has no abrupt cut-off. It slowly becomes thinner and fades away into space. There is no definite boundary between the atmosphere and outer space. Three-quarters of the atmosphere's mass is within 11 km of the planetary surface. In the United States, persons who travel above an altitude of 50.0 miles (80.5 km) are designated as astronauts. An altitude of 120 km (75 mi or 400,000 ft) marks the boundary where atmospheric effects become noticeable during re-entry. The Karman line, at 100 km (62 mi), is also frequently used as the boundary between atmosphere and space.
Temperature and the atmospheric layers
The temperature of the Earth's atmosphere varies with altitude; the mathematical relationship between temperature and altitude varies between the different atmospheric layers: More on [ Earth's atmosphere ]
Aircraft Systems Engines
Model Aviation :: Aviation
Aeronautics :: Aerospace
Now On Air[01:04] ãã£ã¤ã ï¼ / é´æ¨ããã / FAX : 048-650-0300 (Songs) LOVE LETTER / MIHIMARU GT [ãªã¯ã¨ã¹ã:]
NACK5_fan (NACK5_LISTENER) Thu, 07 Jan 2010 16:07:00 -0000
Now On Air[01:04] チャイム！ / 鈴木あきえ / FAX : 048-650-0300 (Songs) LOVE LETTER / MIHIMARU GT [リクエスト:]
I'm off for a break. going outside to breathe fresh air)))
MarsiAnka (Ann) Thu, 07 Jan 2010 16:04:49 -0000
I'm off for a break. going outside to breathe fresh air)))
Call for government apology over air quality 'cover-ups' and @CleanAirLondon update published about NAO report etc http://bit.ly/819J29
CleanAirLondon (Clean Air in London) Thu, 07 Jan 2010 15:56:47 -0000
Call for government apology over air quality 'cover-ups' and @CleanAirLondon update published about NAO report etc http://bit.ly/819J29
RT @SayBro: bro i dont understand why ppl air out personal biz on twitter ..@hiphopnonstoptv I think it folks that need attention...--Agree
hiphopnonstoptv (hiphopnonstoptv) Thu, 07 Jan 2010 15:51:16 -0000
RT @SayBro: bro i dont understand why ppl air out personal biz on twitter ..@hiphopnonstoptv I think it folks that need attention...--Agree
Dan ketika slh satu shabat memelukku,,air mataku lsg menetes,aku pun lsg pergi.*tdk kuat nhn air mata,hingga skrng air mata itu msh menetes*
Masrul_Harindra (masrul harindra) Thu, 07 Jan 2010 15:49:03 -0000
Dan ketika slh satu shabat memelukku,,air mataku lsg menetes,aku pun lsg pergi.*tdk kuat nhn air mata,hingga skrng air mata itu msh menetes*
[resources] 15 Out-Of-The-Oven Adobe AIR Applications For Designers & Developers http://bit.ly/8FM911
yamasas (yamasas) Thu, 07 Jan 2010 15:44:23 -0000
[resources] 15 Out-Of-The-Oven Adobe AIR Applications For Designers & Developers http://bit.ly/8FM911
Jet Engine Research Laboratories - Israel Institute of Technology. Does theoretical and experimental RD work in jet engines and gas turbines, for high-efficiency low NOx small-medium engines.
Blastwave Jet Company - Information on a little known bent pipe blast wave or pulse jet engine.
Meta Description: [ BLASTWAVE JET CO. ]
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Boeing Technology Services - Aerodynamics - Wind tunnel test facilities
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NASA General Aviation Propulsion Program - Program to improve small airplane engines.
Ultra-Efficient Engine Technology Program - NASA sponsored program to research and develop next generation aircraft engines.
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