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The Earth's atmosphere (or air) is a layer of gases surrounding the planet Earth that is retained by the Earth's gravity. It has a mass of about five quadrillion metric tons. Dry air contains roughly (by volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, and trace amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night. There is no definite boundary between the atmosphere and outer space. It slowly becomes thinner and fades into space. An altitude of 120 km (75 mi) marks the boundary where atmospheric effects become noticeable during atmospheric reentry. The Kármán line, at 100 km (62 mi), is also frequently regarded as the boundary between atmosphere and outer space. Three quarters of the atmosphere's mass is within 11 km (6.8 mi; 36,000 ft) of the surface. From Wikipedia under the
GNU Free Documentation License  blog-imgs-13.fc2.com 768px x 1024px | 216.80kB [source page] imgs 13 fc2 com x x s xxsilvermoonlightxx Air 129 jpg http blog imgs 13 fc2 com x x s xxsilvermoonlightxx Air 130 jpg http blog imgs 13 fc2 com x x s xxsilvermoonlightxx Air 131 jpg http blog imgs 13 fc2 com x x s xxsilvermoonlightxx Air 132 jpg http blog imgs 13 fc2 com x x s xxsilvermoonlightxx Air 133 jpg http blog imgs 13 fc2 com x x s xxsilvermoonlightxx  mhr-usa.com 1140px x 812px | 185.80kB [source page] Date Posted 09 20 05 19 29 How about a low profile one or a 45 angle one http www mhr usa com arreche img arr air filter b jpg Grey Live to ride Ride to work From Yahoo Image Search: "Air"  techcrunch.com Michael Arrington 2009-06-16 07:32:06 Orders for the new iPhone 3G S are now in the . air. from Shenzen, China. And people who ordered them right away last ...  airamerica.com Beau Friedlander 2009-06-16 22:30:20 Air. America intern Leah Wawro hit Union Square to find out what New Yorkers know about the election in Iran. What do people think about the outcome? Was it rigged? And can anyone actually pronounce Ahmadinejad? ...  atwonline.com unknown 2009-06-14 15:31:10 ATWOnline.com provides daily news about airline, . air. transport and related industries, traffic, financial, aircraft transactions, aviation jobs, and articles excerpted from . Air. Transport World Magazine and Airport Equipment and ... From Google Blog Search: "Air"  dallasnews.com Dallas Morning News, TX St. John will compete next week in the Air Race Classic, flying from Denver to Atlantic, Iowa. That city is the final stop in the 80th annual Air Race Classic, a four-day event for female pilots. St. John, 54, of Forney and her co-pilot will take to ... Women race cross country in historic Air Race Classic Norman Transcript Broomfield pilot to compete in Women's Air Race YourHub.com all 7 news articles  online.wsj.com Wall Street Journal CEO Egon Behle told a small group reporters at the Paris Air Show that MTU is willing to wait for the right acquisition and that ideally it will find a company in the engine technology business. MTU is most interested in a European acquisition, ... MTU expects better 2011 after weak 2010 Reuters Geared turbofan is green leader, says MTU Aviation International News AIRSHOW-MTU, suppliers could face penalties over A400M Reuters all 43 news articles  bizjournals.com Bizjournals.com, NC Goodrich Corp. has signed a contract with Scandinavian Airlines System to provide thrust-reverser overhaul services on the carrier's Airbus A320 aircraft. The five-year deal is valued at $8 million. The contract includes an option for SAS to extend the ... From Google News Search: "Air" Is it ok to cover an air return vent with a picture if proper clearance is provided? Q. We would like to hide an ugly air return with a picture. To provide proper clearance for the air return we would like to mount two 2x4's at the top and bottom of the air return nailed through the drywall. The picture would then mount flat on the 2x4s providing either 1 1/2 " or 3 1/2" (depending which side of the the stud we use) of side access for the air to pass through. Is this ok? PS - The air return is very, very, very ugly. Asked by raychance - Mon Jan 21 12:51:43 2008 - - 7 Answers - 0 Comments A. I hear you on this one too - sooo ugly and in my house they are right where they shouldn't be sticking out like a sore thumb, I tried hiding them too, but get ready to dust off your picture every other day and your heating system won't run efficiently either. I finally just painted them the room color and I'm learning to just ignore them. Answered by TORI - Mon Jan 21 22:44:22 2008 What do the controls on my air conditioner unit do? Q. I have an air conditioner unit. It sits on the windowsill of my apartment. The maker appears to be a registered trademark named Simplicity. The unit has the two modes, air conditioner mode and fan mode. It seems to have a control for three speeds, high, medium and low. Then there is a control to make two blades glide back and forth. I should think those are to circulate the air inside the apartment here? These blades have a switch for close and open. The unit has what looks like a timer control, it is a button with a clock symbol. I guess that is so the air conditioner goes on and off at a specified hour. There are the important temperature controls. One control that has got me a little confused is a button with a picture of a… [cont.] Asked by parrotdaryl - Tue Jun 12 23:13:50 2007 - - 2 Answers - 0 Comments A. Google for that model's owners manual. Answered by smart boratt brother - Tue Jun 12 23:34:27 2007 How come air resistance is greater on an object with a larger surface area?
Q. As compared to a bowling ball and a marble, how come the bowling ball hits the ground first due to air resistance? Doesn't air resistance slow and object down? Doesn't air resistance slow an object down? Asked by Ares - Tue Oct 21 19:29:48 2008 - - 2 Answers - 0 Comments A. The bowling ball has more surface area and more air restistance. But the marble has more surface area and more air resistance per unit mass. This means the marble will fall slower. *** For example. Let's assume that the radius of a marble is 1/10th that of the bowling ball. Surface area = 4 pi r^2 Therefore the bowling ball will have 10^2 more surface area. But volume is = 4/3 pi r^3 The bowling ball will have 10^3 more volume and mass The air resistance per unit mass for the bowling ball will be: 10^2/10^3 = 1/10 So it will have 1/10 the air resistance. per unit weight. Answered by Frst Grade Rocks! - Tue Oct 21 19:38:05 2008 From Yahoo Answer Search: "Air" Air is one of the four classical elements in ancient Greek philosophy and science, and is often seen as a universal power or pure substance. ContentsSourcedAnother glorious day, the air as delicious to the lungs as nectar to the tongue.
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