maheshw
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A simple question which I interest to know. I have noticed that when some air crafts are gone there is a hard smoke lines in the sky which will disappear after 10-15 mints. This is not for all. So I just noticed it in flightradar24 and it was a Boeing 787\same in 747 as well.
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at 38000 ft, the air temperature should be around -80 degrees. Imagine throwing a bucket of water at that temp. It would freeze instantly. But gravity will start pulling the ice downwards gradually and it will eventually melt. That's why the white trail vanishes after 10-15 mins. Irrespective of the atmospheric condition, this will happen but if the atmospheric conditions are bad (rain/low clouds/heavy dust), you will not see the white trail.
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