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So, here's my question, why on some days there are lines everywhere and on some nothing? You aren't going to tell me there is no air traffic on those days because that's bullshit. It's not wind either that is "blowing" away the lines. So where did they go then?
It's due to changes in air density and relative humidity which results in dew point temperature being different on different days. This changes the altitudes at which the effects of contrails will be noticed. Cloud or ice crystals can spontaneously form with the drop in pressure that occurs at high lift producing points of the wing. Jet exhaust also produces trails by the soot acting as a condensation point for the water vapor.
Every day is different, as evidenced by the synoptic chart with the isobars connecting points of equal pressure changing by the hour.
https://www.encyclopedia.com/earth-and-environment/atmosphere-and-weather/weather-and-climate-terms-and-concepts/dew-point
It's called humidity. Same as the exhaust coming out of your car. Some days you see it coming out of your car, because of the higher moisture levels. Some days you don't see it (drier days). Same goes for warm/moist airplane exhaust coming from the engines. As this warm/moist air cools, you no longer see it. That's why it vanishes. It's moisture. Humidity levels change every single day. Same goes for your warm breath on a cold & humid morning. It disappears as it cools and reaches the same temperature as the air temperature. Basic science.
Hmmm...maybe, but I've never seen car exhaust remain for hours and slowly spread out over the roads and surrounding fields.
The question above asked, why on some days there are lines everywhere and on some nothing? Well....I answered that. Educate yourself with a little basic science in this short video. It addresses your question about "lingering" at the end of the video. Have you ever watched clouds form over a mountain range throughout the day? Same principle.
Contrails...not chemtrails
And why on somedays are there only two or three coming from here from the same airport? I just saw that yesterday. SLC International Airport has planes coming and going all day every day. I was watching them come and go like normal in a perfectly blue sky and then, bam. One jet. One contrail. Spanned the whole sky. Made half the sky look murkey about an hour later. Not a single other trail the entire day from any other plane. Did that plane just pick a particularly humid spot in the sky to fly that day? I’m not arguing with you. But you just explained why some days tons and some days none. What about days when certain planes do and certain planes don’t?
Stop the condescension. I understand how humidity works. My retort still stands with car exhaust. The same "scientific" principles should work both with cars and planes, yes? Or is there a different "science" for each? Must be a different humidity for planes?
Riddle me this, Mr Science:
How is it, on the same day - and at the same time - one can see two similar planes flying at roughly the same altitude, one plane leaves a long, never dissipating trail, while the other plane leaves a trail that disappears almost immediately?
By the way, I missed the fact that this thread is 6 months old when replying.
It must have been reanimated.
Same here, it's because of the sticky.
They don't "go" anywhere. It is like clouds and rain. Some days you have them (if airplanes are flying) and some days you don't have them (if airplanes are flying). It depends on the weather conditions at flight altitude, not at ground level. To the extent that the trails gradually dissipate by being smeared or moved along, that is caused by wind. What happens at 30-40 thousand feet is not the same as at the ground. The ground is in what is called a "boundary layer," which have generally zero wind at surface level, even if there is a current of air higher up.
Thank you.
We all recognize that governments have been spraying icky stuff from planes for decades.
But some people rant about "chem trails" without knowing the basic science behind clouds. They don't understand most contrails are just water vapor coming off the wings of a plane. They end up sounding misinformed (because they are), and it makes GAW appear less credible to newcomers.
I think that's who Cats is referring to with "chem-tards."
Why do some days only a few planes have them? This past sunday was out at the park near SLC Int. Airport. Perfectly clear. Then one jet left two long contrails from the wings and not a single other jet left one the whole day. Spotted lots of other jets that day too but they just looked like shiny cans moving through the sky without a wake. Why would only one leave one?
You have to realize that contrails are clouds of ice crystals, subject to technical and environmental variables. If the air is "dry" (not saturated with water vapor), the contrails will not form. If the air is saturated enough for them to form, the conditions may not be homogeneous throughout large spaces. It has been established that the ice crystals that form contrails depend on the production of soot particles from the jet engine combustion, so the brand and thrust level of the engines may affect this. Finally, if there is a trail that truly is produced by the wings and not the engines, that is a slightly different phenomenon resulting from moist (but not saturated) air passing through the low pressure (and thus low temperature) airflow over the wing.
So in theory literally one jet out of the hundreds that came and went that day could find those conditions while none of the others could?