Streaks of condensed water vapor created in the air by jet airplanes at high altitudes. (Merriam-Websters)
Streamer of cloud sometimes observed behind an airplane flying in clear, cold, humid air. (Encyclopaedia Britannica)
A visible cloud streak, usually brilliantly white in color, which trails behind a missile or other vehicle in flight under certain conditions. (DOD Dictionary of Military Terms)
Contrails can exist in two forms: water droplet and ice crystal.
Under what conditions do Contrails form?
The primary factors in contrail formation are air temperature and moisture content. They are usually seen at the higher colder altidtudes, but will even occur at ground level in Antartica, sometimes causing a visibility problem for jets that take too long to take-off. Contrails started becoming a common sight during World War II, when bombers started flying at altitudes above 30,000 feet. They can exist in two forms: water and ice. A water droplet contrail occurs when an airplane flies though cold and supersaturated moist air and the warm water vapour produced by the engine condenses into tiny droplets. Under colder temperatures the water will freeze creating suspended ice-crystals.
The following graph represents contrail data collected for Houston, TX over several months. See the Trail Research Report for full details.
Temperature and Humidity (degrees of separation between Dew Point and Temperature).
Red points indicate longer relative contrail persistence, blue shorter persistence.
A Contrail forms upon condensation of water vapour produced by the combustion of fuel in the airplane engines. When the ambient relative humidity is high, the resulting water-droplet and/or ice-crystal plume may last for several hours. The trail may be distorted by the winds, etc. (Encyclopaedia Britannica)
What are Chemtrails?
Streaks of chemicals created in the air by spray systems on airplanes at any altitude. Chemicals are sprayed via planes for many purposes including crop dusting and mosquito control. Also fuel is sometimes dumped to reduce weight before landing. But within the Chemtrail observer community Chemtrails are the product of an active large scale operation.
Chemtrails are said to vary from contrails in their length of persistence.
See also.
What the hell is really going on?
Some people are reporting what they describe to be unusual activity in the sky, including jets leaving trails at low altitudes, spray lines creating X's, S's and parallel lines, lines that slowly spread to create a canopy of haze, and reports of unusual smells, tastes, and even illness related to the trails.
Also, a reddish-brown gel, dropped from low-flying aircraft, has been observed by people in the past and was even documented on Unsolved Mysteries. Samples of this substance have been alledgedly analyzed by Margareta-Erminia Cassani and found to be teaming with biological organisms.
What would be the purpose of releasing these chemicals or biological agents?
This must be decided by the reader for themselves.
Posted by
douglasalanbickford
on Dec 08, 2008
30 Views - 0 Comments
24 Views - 0 Comments