Contrails vs chemtrails. Contrails from propeller-driven aircraft engine exhaust, early 1940s. Contrails, or condensation trails, are streaks of condensed water vapor created in the air by an airplane or rocket at high altitudes.These condensation trails are the result of normal emissions of water vapor from piston engines and jet engines at high altitudes in which the water vapor condenses into a visible cloud. Contrails are formed when hot humid air from the engines mixes with the colder surrounding air. The rate at which contrails dissipate is entirely dependent on weather conditions and altitude. If the atmosphere is near saturation, the contrail may exist for some time. Conversely, if the atmosphere is dry, the contrail will dissipate quickly. Exhaust gases and emissions It is well established by atmospheric scientists that contrails can not only persist for hours, but it is a perfectly normal characteristic for them to spread out into cirrus sheets. The different sized ice crystals in contrails descend at different rates, which spreads the contrail vertically. Then the differential in wind speeds between altitudes (wind shear) results in the spreading of the contrail across many miles in the sky. This mechanism is similar to the formation of cirrus uncinus clouds. Contrails between 25,000 and 40,000 feet can often merge into an almost solid interlaced sheet. Contrails can have a lateral spread of several kilometers, and given sufficient air traffic it is possible for contrails to create an entirely overcast sky which increases the ice budget of individual contrails and persists for hours. Contrail testing being carried out on an Airbus A340 and much older Boeing 707. The term chemtrails, coming from the words chemical trails in the same fashion that the term contrail comes from the words condensation trail, is a term coined to suggest that contrails are formed by something other than a natural process of engine exhaust hitting the cold air in the atmosphere. Proponents of the theory of the existence of chemtrails characterize these phenomena as streams that persist for hours and that, with their criss-cross, grid-like or parallel stripe patterns, eventually blend to form large clouds. Proponents view the presence of visible color spectra in the streams, unusual concentrations of sky tracks in a single area, or lingering tracks left by unmarked or military airplanes flying at atypical altitudes or locations as markers of chemtrails.
Posted on: Fri, 08 Nov 2013 08:34:44 +0000
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