Jets leave white trails, or contrails, in their wakes for the same reason you can Jet Planes Leave Trail Tool sometimes see your breath. The hot, humid exhaust from jet engines mixes with the atmosphere, which at high altitude is of much lower vapor pressure and temperature than the exhaust gas. The water vapor contained in the jet exhaust condenses and may freeze, and this mixing process forms a cloud very similar to the one your hot breath makes on a cold day.  Any particles present in the air provide additional sites. Depending on a plane's altitude, and the temperature and humidity of the atmosphere, contrails may vary in their thickness, extent and duration. The nature and persistence of jet contrails can be used to predict the weather. Thanks For www.- are the white cloud that come from planes????All rights Jet Planes Leave A White Trail Behind Them Because Theorem for the pictures and music goes to the owners. Some planes in the sky leave trails that persist and spread, and other planes, in the same sky, leave short-lived trails, or no trails at all. These trails are actually called contrails, short for “condensation trails”. They are not smoke from the engines, they are formed when the water in jet engine exhaust (and there’s quite a lot of it, like car exhaust on a cold day) mixes with wet cold air and condenses and freezes into ice crystals. Contrails are actually a type of cirrus cloud. When the air is wet and cold enough the trails can stay around for a long time, and sometimes spread out.
Some planes in the sky leave trails that persist and spread, and other planes, in the same sky, leave short-lived trails, or no trails at all. These trails are actually called contrails, short for “condensation trails”. They are not smoke from the engines, they are formed when the water in jet engine exhaust (and there’s quite a lot of it, like car exhaust on a cold day) mixes with wet. Feb 22,  · Boeing has recommended that airlines ground all s with the type of engine that blew apart after takeoff from Denver this past weekend, and most carriers that fly those planes . DENVER — The Federal Aviation Administration on Tuesday ordered airlines in the United States to ground planes with the type of engine that blew apart after takeoff from Denver this past weekend until they can be inspected for stress cracks. The FAA's order applies to U.S. operators of airplanes equipped with certain Pratt & Whitney PW engines, which are used solely on Boeing s.

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