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Contrails are condensation trails. Burning jet fuel creates water vapor. Under the proper conditions, this water vapor can condense into a visible trail that forms along the path of the airliner. These trails are the same as any cloud that forms under natural conditions.Burning gasoline, diesel fuel, propane, natural gas, or any other hydrocarbon fuel also produces water vapor. This will often times produce a visible cloud during cold weather. It will usually dissipate much more quickly than contrails.
Contrails (short for "condensation trails") or vapour trails are artificial clouds that are the visible trails of condensed water vapour made by the exhaust of aircraft engines. As the hot exhaust gases cool in the surrounding air they may precipitate a cloud of microscopic water droplets. If the air is cold enough, this trail will comprise tiny ice crystals.[1]The wingtip vortices which trail from the wingtips and wing flaps of aircraft are sometimes partly visible due to condensation in the cores of the vortices. Each vortex is a mass of spinning air and the air pressure at the centre of the vortex is very low. These wingtip vortices are not the same as contrails.Depending on atmospheric conditions, contrails may be visible for only a few seconds or minutes, or may persist for many hours
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