Contrail

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Sinuous vapour trail over south-east Poland.

Contrails (; short for "condensation trails") or vapor trails are long thin artificial clouds that sometimes form behind aircraft. Their formation is most often triggered by the water vapour in the exhaust of aircraft engines, but can also be triggered by the changes in air pressure in wingtip vortices or in the air over the entire wing surface. Like all clouds, contrails are made of water, in the form of a suspension of billions of liquid droplets or ice crystals.

• See also: Wikipedia, Wiktionary, Commons

• Related: Fallstreak hole, Aviation and the environment, Chemtrail conspiracy theory, Cirrus cloud, Global dimming, Ship tracks, Skywriting

Contrails.nl: Pictures of Contrails and Aviation C... Contrails.nl: Pictures of Contrails and Aviation Cirrus (-Smog), from 1995 on. www.contrails.nl/index.htm - Web

Abstract of article in Nature announcing research ... Abstract of article in Nature announcing research results of contrail temperature change study www.nature.com/.../418601a_fs.html&filetype= - Web

Clouds Caused By Aircraft Exhaust May Warm The U.S... Clouds Caused By Aircraft Exhaust May Warm The U.S. Climate www.sciencedaily.com/releases/2004/04/040428061056.htm - Web

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Gallery for «Contrail»

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Contrails over the USA Contrails over the USA antwrp.gsfc.nasa.gov/apod/ap041013.html - Web

Effects of contrails on ground astronomy Effects of contrails on ground astronomy news.bbc.co.uk/2/hi/science/nature/4755996.stm - Web

Contrail simulator (Java applet) Contrail simulator (Java applet) profhorn.aos.wisc.edu/.../contrail_applet.html - Web

Contrails: What's Left Behind Is Bad News, article... Contrails: What's Left Behind Is Bad News, article by Nick Onkow from March 4, 2006 www.airliners.net/articles/read.main?id=85 - Web

NASA Contrail Education NASA Contrail Education asd-www.larc.nasa.gov/GLOBE/ - Web

What is a contrail and how does it form? What is a contrail and how does it form? www.wrh.noaa.gov/fgz/science/contrail.php - Web

Vapor Trails Vapor Trails books.google.com/.../books?id=KCcDAAAAMBAJ&pg=PA55&dq=popular+science+antitank+1941&hl=en&ei=KgiXTNPbOsuhnAeItuD7Bw&sa=X&oi=book_result&ct=result&resnum=5&ved=0CDkQ6AEwBDgK#v=onepage&q&f=true - Web

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