What is the white line behind a jet when its in the sky?

Answer 1

Contrails - which are ice crystals.

Jet fuel is a kerosene based fuel, and often contains suspended water droplets...

When the fuel is burnt at high altitude, the gases from the exhaust of the jet carry these water particles (which are obviously unburnt) into the atmosphere behind the aircraft where they promptly freeze due to the extremely cold outside air temperature - and form the contrails we see as a white line!

Hope this helps :-)

Answer 2

a number of those are quite inventive solutions and under no circumstances quite close to the reality. only imagine - the exterior air temperature on the altitude that those plane are flying at is round -40deg C. it truly is nicely lower than the freezing aspect of water, and nicely above cloud aspect, so there is no water vapour available to reason those trails. What you're seeing is the outcome of the gasoline being burnt, the engines produce water vapour as a fabricated from burning hydrocarbon fuels in the very similar way that any vehicle will produce a white vapour more desirable seen on chilly days. White trails that are seen coming from the guidelines of the wings happen at a lot decrease altitudes, typically at the same time as the O.A.T. is only above freezing. they're brought about through the better pressure air lower than the wing (sic) passing to the decrease pressure area on the properly of the wing. they're typically very short lived and are customary as 'wing tip vortices' that typically stick with a spiral route faraway from the wing tip. wish this helps

Answer 3

Behind a jet it's contrails, that disappear quickly. Behind a jet long thick wide white lines are chemtrails. They don't disappear quickly takes about 20 min. to disperse. Go to a chemtrail site that explains the dxifferences between the two.

Answer 4

The trail behind a jet is called a contrail. Aircraft engines increase the moisture in the air, since steam is a component of their exhaust, and high altitudes may cause the moisture in the air to condense into clouds of water drops or ice, and this is what we see as the white trails behind them. Technically contrails are also cirrus clouds.

More information about contrails here:
http://en.wikipedia.org/wiki/Contrail

Answer 5

the white line behind a jet is may be a gas which is exerted by the jet when its in the sky.

Answer 6

Water is a by product of combustion. Most of us have seen water vapor coming out of the tail pipe of a car in cold weather. We do not see the water vapor coming out of the tail pipe of a car in warm weather because the water vapor does not freeze into ice crystals in warm weather. I have an unvented gas heater in my home. I do not had to use a humidifier in my home as long as I use my unvented gas heater because the heater produces all the humidity I need. The vapor trail coming out of a jet engine at high altitude is simply water vapor freezing into a cloud of sourts. You will notice that immediately behind the jet engine there is a space where you see no vapor trail, that is because the hot exhaust has not cooled off enough to freeze the vapor yet, but shortly there after it does freeze. There does not have to be any moisture in the fuel for this to happen. It will always happen at high altitude because moisture (water) is a by product of combustion. Indeed, water in the fuel however would be a dangerous situation especially at high altitude, because the water would freeze in the fuel tanks. The vapor trail not only happens with jets, but also with piston driven propellered aircraft at high altitude for the very same reason. Again, water is a by product of combustion. Have you ever seen old world war two footage of bombers at high altitude, they were not jets, but the vapor trails were there.

Answer 7

Actually what happen is that the jet releases a gas namely carbon dioxide in the sky and since there is no movement of air at higher altitudes(sky)i.e negligible movement of air is there (very slow) that,s why the white lining is seen for sometime in the sky and lastly it vanishes.

Answer 8

Water vapor.Kinda like fog in the air caused by either the heat of the engine exhaust or heat from friction at the wing tips on fighter type jets.

Answer 9

moisture from the jet engine condenses and forms the white lines. Just like when you exhale in the winter you see your breath.

Answer 10

contrails, I've heard some hippies claim that certain jets/planes use these trails to seed the sky with allergy causing agents.