Jisho

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ひこうきぐも 飛行機雲
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Noun
1. contrail; vapor trail; vapour trail​
Wikipedia definition
2. Contrail​Contrails or vapour trails are long thin artificial clouds that sometimes form behind aircraft. Their formation is most often triggered by the water vapour in the exhaust of aircraft engines, but can also be triggered by the changes in air pressure in wingtip vortices or in the air over the entire wing surface. Like all clouds, contrails are made of water, in the form of a suspension of billions of liquid droplets or ice crystals.
Read “Contrail” on English Wikipedia
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