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Contrails (/ ˈ k ɒ n t r eɪ l z /; short for "condensation trails") or vapor trails are line-shaped clouds produced by aircraft engine exhaust or changes in air pressure, typically at aircraft cruising altitudes several kilometres/miles above the Earth's surface. They are composed primarily of water, in the form of ice crystals.
An Airbus A340's engines leaving a water condensation trail – miniature clouds formed by the engine exhaust. The chemtrail conspiracy theory / ˈ k ɛ m t r eɪ l / is the erroneous [1] belief that long-lasting condensation trails left in the sky by high-flying aircraft are actually "chemtrails" consisting of chemical or biological agents, sprayed for nefarious purposes undisclosed to the ...
Are chemtrails real? Here’s everything you need to know about the popular conspiracy theory.
Persistent condensation trails (contrails) formed by ice crystals originating from water vapor emitted by aircraft engines. Usually resembles cirrus; recognized as a WMO genitus cloud cirrus homogenitus (man-made). Further transformation into cirrus, cirrocumulus, or cirrostratus homomutatus is possible depending on atmospheric stability and ...
In real-world terms, this would mean an increase of around 50 minutes to a transatlantic flight. ... These were less groundbreaking, with suggestions for further research into reducing contrails ...
The water-vapor condensation mechanism in wingtip vortices is thus driven by local changes in air pressure and temperature. This is to be contrasted to what happens in another well-known case of water condensation related to airplanes: the contrails from airplane engine exhausts.
Contrails are composed when hot, humid air from the engines condenses into ice crystals in the cold air, the National Weather Service says. While they often fade quickly, especially in dry weather ...
Contrails are an artificial type of cirrus cloud formed when water vapor from the exhaust of a jet engine condenses on particles, which come from either the surrounding air or the exhaust itself, and freezes, leaving behind a visible trail.