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A vapor trail, or contrail, is caused by the water vapor in aircraft exhaust mixing with the cold, low-pressure air at high altitudes. When the hot, moist air from the engines rises and cools rapidly, it condenses into tiny water droplets or ice crystals, forming visible clouds. The persistence of these trails depends on atmospheric conditions, such as humidity and temperature. If the surrounding air is humid enough, the contrail can last for an extended period, otherwise, it may dissipate quickly.

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1w ago

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