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Contrail is short word of "condensation trail". The other name is vapor trail. This is thin artificial clouds that sometimes form behind aircraft. Their formation is most often triggered by the water vapor in the exhaust of aircraft engines. But the formation can also be triggered by changes in air pressure in wingtip vortices or in the air over the entire wing surface. Contrails are made of water in the form of a suspension of billions of liquid droplets or ice crystals.
Contrails are formed when hot humid air from the engines mixes with the colder surrounding air. The rate at which contrails dissipate is entirely dependent on weather conditions and altitude. If the atmosphere is near saturation, the contrail may exist for some time. Conversely, if the atmosphere is dry, the contrail will dissipate quickly.