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During winter season, a white trail at t...

During winter season, a white trail at the back of a flying plane is observed in a clear sky. Explain.

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1.During winter season, as the plane flies, the vapour released by the aeroplane's engine condenses and fonns clouds.
2. If the surrounding air is having more relative humidity, it takes a long time for the white trail formed by condensation of the vapour to disappear.
3. Hence, a white trail at the back of a flying plane is observed in a clear sky.
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