Contrails
Sunset and two aircraft contrails visible in the sky.
Their formation is most often triggered by the water vapour in the exhaust of aircraft engines, but can also be triggered by the changes in air pressure in wing tip vortices or in the air over the entire wing surface. Like all clouds, contrails are made of water, in the form of a suspension of billions of liquid droplets or ice crystals.
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- Nikon D5100
- 1/100
- f/11.0
- 270mm
- 100
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