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originally posted by: SubTruth
a reply to: Rob48
I have a question OP can they turn on/off the spraying? I was at work the other day taking a break and noticed a plane in the sky leaving a contrail I just assumed it was normal until it looked like some one took an eraser to part of the trail. This happened a about 5-6 times across the sky. It was like they were turning it on/off.
originally posted by: Tucket
originally posted by: tsurfer2000h
a reply to: Tucket
So why wasnt there any natural cloud formation in the sky at 9am in Robs first pics?
Well if the nuclei isn't there for a cloud to form they won't. Unlike a contrail that creates the nuclei for the contrail to form which is why you didn't see clouds but did see the contrails to form.
Does that help answer your question?
Almost, Surfer. But I also want to know why Contrails continue to form even after there is no heat left for supercooling(the nucleation process).
originally posted by: Tucket
originally posted by: tsurfer2000h
a reply to: Tucket
So why wasnt there any natural cloud formation in the sky at 9am in Robs first pics?
Well if the nuclei isn't there for a cloud to form they won't. Unlike a contrail that creates the nuclei for the contrail to form which is why you didn't see clouds but did see the contrails to form.
Does that help answer your question?
Almost, Surfer. But I also want to know why Contrails continue to form even after there is no heat left for supercooling(the nucleation process).
originally posted by: Rob48
originally posted by: Tucket
originally posted by: tsurfer2000h
a reply to: Tucket
So why wasnt there any natural cloud formation in the sky at 9am in Robs first pics?
Well if the nuclei isn't there for a cloud to form they won't. Unlike a contrail that creates the nuclei for the contrail to form which is why you didn't see clouds but did see the contrails to form.
Does that help answer your question?
Almost, Surfer. But I also want to know why Contrails continue to form even after there is no heat left for supercooling(the nucleation process).
I really want to know what you mean by "no heat left for supercooling"? Since when did heat provide cooling?
The exhaust comes out at high temperature. The air at that altitude is at about -50°C. That is what supercools it: the cold air.
When the water vapour in the exhaust cools it forms ice crystals. Those are the nucleation sites.
originally posted by: waynos
The supercooling takes place simply because the jet exhaust is emerging into an ambient temperature of minus 30 degrees or so everywhere all around it. Most of the contrail wasn't part of the combustion process at all, it comes from bypass air that moisture condenses out from due to sudden and massive depressurisation, this moisture also freezes along with that from the jet exhaust, which is why contrails from modern engines are thicker than they used to be in decades gone by.
The small amount of ice in the exhaust provides nucleation sites for cloud.
originally posted by: MagicWand67
a reply to: Rob48
Still spreading your same old lies I see. It's not the small amount of ice in the exhaust.
It's the large amount of pollution in the exhaust that provides the nucleation sites.
Once again another thread created by skeptics. Baiting people to debate chemtrails.
You've also included a video which has been shown on here several times, but which is about SRM theories ( which I think most of us view with suspicion and would rather weren't carried out), not aircraft contrails. You clearly think it relevant, can you explain why?
Does anything in the video pertain to this discussion?