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What you see is not smoke- they are contrails- short for condensation trails. The air is extremely cold at that altitude, the exhaust is hot, and contains a great deal of water vapor. When it comes in contact with the cold air, it condenses, and becomes visible, like fog or clouds. Ever see the "steam" roll out of the bathroom after a hot shower? Same idea.

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Q: Why do planes leave white lines in sky?
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How do planes stay in the sky?

because the airfoil shape makes tiny air molecules at the bottom slow down and the top speed up. The engine just pushes the plane.


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Vertical lines communicate a feeling of loftiness and spirituality. Erect lines seem to extend upwards beyond human reach, toward the sky. They often dominate public architecture, from cathedrals to corporate headquarters. Extended perpendicular lines suggest an overpowering grandeur, beyond ordinary human measure.-eNysH2gm_eNysH2rc


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Kites have no parallel sides.It can have either 2 parallel sides, or none at all.Well, the definition of paralell is that two lines that can run along each other and not run into each other. So if you look at a kite as you see it in cartoons, it would have no parallel lines because the the Bottom Lines hit each other and so do the top. The answer is no

Related questions

What is the name of white trail in the sky that planes leave behind?

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