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Moisture
Dew Point 49 °F
Average Humidity 76
Maximum Humidity 89
Minimum Humidity 63
Contrails form when hot humid air from jet exhaust mixes with environmental air of low vapor pressure and low temperature. Vapor pressure is just a fancy term for the amount of pressure that is exerted by water vapor itself (as opposed to atmospheric, or barometric, pressure which is due to the weight of the entire atmosphere above you). The mixing occurs directly behind the plane due to the turbulence generated by the engine. If condensation (conversion from a gas to a liquid) occurs, then a contrail becomes visible. Since air temperatures at these high atmospheric levels are very cold (generally colder than -40 F), only a small amount of liquid is necessary for condensation to occur. Water is a normal byproduct of combustion in engines..
The length of time that a contrail lasts is directly proportional to the amount of humidity that is already in the atmosphere. A drier atmosphere leads to a more short-lived contrail, while an atmosphere that has more humidity will lead to longer-lived contrails. However, if the atmosphere is too dry, no contrails will form. Occasionally a jet plane, especially if ascending or descending, will pass through a much drier or more moist layer of atmosphere which may result in a broken pattern to the contrail, with it appearing in segments rather than in one continuous plume.
and I'm sure it's probably a missile,
Originally posted by Caintic
reply to post by liejunkie01
again never said this was a chem trail. I was talking about cloud seeding. As for never noticing contrails before finding out about chemtrails. it's just not true, I've had my eyes in the sky for some time now.
Now I'm not going to claim this is "chem trails" nor do I think they are normal contrails either.
Now I'm not going to claim this is "chem trails" nor do I think they are normal contrails either.
Now I'm not going to claim this is "chem trails" nor do I think they are normal contrails either.