Question

During winter season we observe white trail at the back of flying plane in the sky why?

Answer 1

air is very cold. hot and humid air from the engine exhaust mix with the coldest surrounding air causing the water vapour to condense into droplets or ice crystals that form visible clouds. the rate at which contrails dissipate is entirely dependent on weather conditions

Answer 2

Answer:

Air is very cold. hot and humid air from the engine exhaust mix with the coldest surrounding air causing the water vapour to condense into droplets or ice crystals that form visible clouds. the rate at which contrails dissipate is entirely dependent on weather conditions.