Contrails (/ˈkɒntreɪlz/; short for "condensation trails") or vapor trails are line-shaped clouds sometimes produced by aircraft engine exhaust, typically at aircraft cruise altitudes several miles above the Earth’s surface. Contrails are composed primarily of water, in the form of ice crystals. The combination of water vapor in aircraft engine exhaust and the low ambient temperatures that often exists at these high altitudes allows the formation of the trails. Impurities in the jet exhaust from the fuel, including sulfur compounds (0.05% by weight in jet fuel) provide some of the particles that can serve as sites for water droplet growth in the exhaust and, if water droplets form, they might freeze to form ice particles that compose a contrail. Their formation can also be triggered by changes in air pressure in wingtip vortices or in the air over the entire wing surface.
Depending on the temperature and humidity at the altitude the contrails form, they may be visible for only a few seconds or minutes, or may persist for hours and spread to be several miles wide, eventually resembling natural cirrus or altocumulus clouds. Persistent contrails are of interest to scientists because they increase the cloudiness of the atmosphere. The resulting cloud forms may resemble cirrus, cirrocumulus, or cirrostratus, and are sometimes called cirrus aviaticus. Persistent spreading contrails are thought by some, without overwhelming scientific proof, to have a significant effect on global climate.
Contrail or Contrails may refer to:
Contrail was an internal Japanese video game developer for Sony Computer Entertainment.
Kinou no kimi no namida dareka no ashita wo kae
Sono dareka no kotoba ga itsuka kimi no namida sukuu
Soushite tsunaide yugami no nai ai wo egaku
Hadashi de mayotte mata deau keshiki
' Life'
watashi wa sore wo shitte irunda
What is' Life'
kimi ni mo miete iru no darou ka
Doko made mo tsudzuku unkai wo kakenukeru taidou
Kon'na itami nado kon'na kusari nado
Mae ni susumu dōryoku kako wa sora ni tokeru
And you'll see a contrail
Ima ikiru kono toki ga nanika no machigai de
Moshi ano bunkiten e modoreru to shite mo watashi wa erabanai
Kotae wa jibun de sagasu katei ni imi wa nai
Soko ni kimi ga inainara
' Life'
watashi wa sore wo shitte irunda
What is' Life'
kimi ni mo miete iru no darou ka
Doko made mo tsudzuku unkai wo kakenukeru taidō
Kon'na itami nado kon'na kusari nado
Mae ni susumu dōryoku kako wa sora ni tokeru
And you'll see a contrail
I didn't know that
Well I know now
I didn't know that
Well I know now
Akirametara mata mirai wa tojiru
Tasuu ni oshidasa re koboreochiru
Tameiki oikake
Utsumukeba mizutamari ni kakaru hikoukigumo
' Life'
watashi wa sore o shitte irunda
What is' Life'
Kimi ni mo miete iru nodarou ka
Doko made mo tsudzuku unkai o kakenukeru taidou
Kon'na itami nado kon'na kusari nado
Mae ni susumu dōryoku kako wa sora ni tokeru
And you'll see a contrail