Contrail

C-27J Spartan with propeller tip vortices condensation.

A distrail is the opposite of a contrail. This photograph of a distrail was taken on November 22, 2012 in Hong Kong.

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.

单词	Vapor Trail
释义	Vapor Trail 原声例句 Crash Course 天文篇 No doubt they were at their windows gawking at the huge vapor trail in the sky when the shock wave hit. 毫无疑问，当冲击波袭来时，他们正呆在窗前，呆呆地望着天空中巨大的波冲击。 TED演讲（视频版） 2018年10月合集 So you jump up -- I mean, there is nothing left of you but a vapor trail. 所以你跳了起来——我的意思是，你什么都没有留下，只剩下一条蒸汽痕迹。挪威的森林 Norwegian Wood I glanced up to find two vapor trails heading off to the west in perfect parallel, like tram tracks. 我抬头一看，发现两条蒸汽轨迹完全平行地向西延伸，就像电车轨道一样。英语百科 Contrail 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.
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Vapor Trail

Contrail