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The REAL Science Behind Those Giant Shadow Lines in the Sky! Contrails form when hot exhaust gases from aircraft engines, which contain water vapor, mix with the cold, low-pressure air at high altitudes, typically below -40°C. The water vapor in the exhaust cools rapidly, condensing into tiny water droplets or ice crystals when the surrounding air is saturated with moisture and the temperature drops below the dew point or frost point. If the temperature is low enough, the condensed water vapor f
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Contrails—short for condensation trails—are the white streaks commonly seen behind airplanes flying at high altitudes. They form when hot, moist exhaust from aircraft engines meets the cold, low-pressure air of the upper atmosphere, causing the water vapor to condense and freeze into tiny ice crystals. These crystals create the visible trails. Depending on atmospheric conditions such as humidity and temperature, contrails may vanish quickly or linger, spreading out to resemble thin, wispy cirrus
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