What are contrails?

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Contrails

Have you ever seen something in sky which looks similar to the picture below.

Image From:-en.wikipedia.org

Here's the explanation for this....

Those white streaks planes leave behind are actually artificial clouds. They're called contrails, which is a shortened version of the phrase “condensation trail."Airplane engines produce exhaust, just like car engines do. As hot exhaust gases escape from a plane, the water vapor in the fumes hits the air. At heights of 26,000 feet or more, the air is extremely cold. The cold air causes the water vapor to condense. This means the water vapor turns into tiny water droplets or even freeze into tiny ice crystals before eventually evaporating. This condensed water vapor and mixture of ice crystals make up the cloud-like trails you see in the sky.

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