Contrails are the “lines” in the sky made by high-flying airplanes. Because they are made of water droplets condensed from the water vapor left by the exhaust from a plane’s jet engines, these vapor trails are classified as clouds.
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Contrails are the “lines” in the sky made by high-flying airplanes. Because they are made of water droplets condensed from the water vapor left by the exhaust from a plane’s jet engines, these vapor trails are classified as clouds.