Contrail
Videos
Contrails or vapour trails are line-shaped clouds produced by aircraft engine exhaust or changes in air pressure, typically at aircraft cruising altitudes several kilometres/miles above the Earth's su
Contrails of a Boeing 747-438 from Qantas at 11,000 m (36,000 ft)
A vintage P-40 Warhawk with propeller tip vortex condensation
A distrail is the opposite of a contrail
Chemtrail conspiracy theory
Videos
The chemtrail conspiracy theory is the erroneous belief that long-lasting condensation trails left in the sky by high-flying aircraft are actually "chemtrails" consisting of chemical or biological age
Contrail
…of drier air immediately above or below a thin cloud layer following passage of an aircraft through the cloud, as shown in the second image below: Chemtrail conspiracy theory Cloud chamber – particle detector that works on similar principle…
An Airbus A340's engines leaving a water condensation trail (contrail) – miniature clouds formed by the engine exhaust
Multiple concurrent contrails. How long they last depends upon the weather, especially the temperature, humidity, and wind speed.
Airbus A380 water-filled tanks simulate passenger weight for different takeoff and landing displacement weights. Similar photographs are sometimes said to show chemtrail planes in action.
Ballast barrels with water in a prototype Boeing 747 flight-test plane