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What makes some airplanes have vapor trail and other don ?

April 26, 2017aircraft airplanes cars trail Transportation vapor

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What makes some airplanes have vapor trail and other don ?

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it all depends on the altitude that the plane is flying at… water vapor crystalizes at a certain temperature and if the temperature at a certain altitude does not meet the required temperature to make a contrail (short for condensation trail), then one will not form… however, if the temperature is at or below the required temperture to form ice crystals, then, obviously, they will form.