What are the white cloud trails in the sky?

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What are the white cloud trails in the sky?

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So basically when airplanes are flying, water vapor is created as a byproduct. At high altitudes the atmosphere is very cold and the water freezes. That’s it. Basically big trails of ice.

You may also be talking about certain kinds of clouds. When there’s a strong wind at a certain level it can stratify the clouds, they can look like rippled potato chips, sometimes they disperse and can look like long trails that are parallel.

Airplane contrails

Basically the soot and hot-air put out by the plane’s engines causes water-vapour in the air to condense into a cloud.

If you watch the sky long enough, you’ll soon see a plane track across the sky leaving a visible contrail behind it.