Jetsteams.?
Answers:
By "jetstream" I'm assuming that you mean contrail.
The contrail is condensation .water vapor. from interaction of the engines and what humidity is in the atmosphere at whatever altitude .
What your thinking of is not known as a jetstream.
A jetstream is the movement of air passed a jet vehicle.
Water forms as a bi-product of the combustion of fuel. The white trail your thinking of is the result of water condensing.
Generally the higher up you go the colder it is (to an extent). The colder an environmen tis the faster conddensation will occur and to a greater extent.
So, the planes that dont have one are in warmer environments and lower altitudes than those which do.
You'll get some good answers to this one, there is a bunch of nut-jobs in the states that believe they are called chem-trails and were being poisoned by the evil governments of the world.
Yeah i know what you're thinking :)
I think you are referring to a "contrail" as a jetstream is the name for the high velocity winds in the upper atmosphere which carry and drive the weather systems Now, as for what makes a contrail, which is actually a contraction of condensation trail. One of the products of combustion is water vapor. If the conditions are right, this water vapor can condense into droplets and there it is a contrail following the plane. If you look closely, through binoculars for example, you will see the trail actually forms quite a ways behind the craft. Humidity is the key factor, not altitude. The higher the humidity, the more likely a cloud will form, same goes for water vapor from the engine exhaust condensing to form a contrail.
are you talking about con trails, jet streams are the winds in the tropopause/stratosphere, which are Westley's that drive the weather systems the temps out side of the jet streams are very cold but in the the wind itself, usually a couple of hundred miles wide, its warmer..
Interestingly enough once you get past the stratosphere the temp begins to rise again..
its alot colder up there than done to earth
What you're asking about is of contrails not jetstreams. When fuel burns it has two end-products, one of which is water, and since tis real cold up there it forms a contrail. Get it ?
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