Question

As jet plane flies high in the sky, it leaves a white trail behind. Give reason why??

Answer 1

as other wehicles leave smoke after combustion the jet engine in the aeroplane also leaves the trail which is made up of smoke and some unburnt fuel

Answer 2

Jets leave white trails, or contrails, in their wakes for the same reason you can sometimes see your breath. The hot, humid exhaust from jet engines mixes with the atmosphere, which at high altitude is of much lower vapor pressure and temperature than the exhaust gas.

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