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[–] 15822968? ago (edited ago)
OK, let's talk about that..... WHAT temperature does the atmosphere have to be for this "condensation" to form? At the altitude that these planes are flying, what is the temperature of the atmosphere? Does the temp change much at that altitude? Why do the "condensation trails" appear on some days, but not others? Does the upper atmosphere temperature change that much? (at say.... 35,000-40,000 feet) What would cause condensation to start --and then stop-- and then start again in the sky like this?
http://stateofthenation2012.com/wp-content/uploads/2014/01/chemtr31.jpg
[–] 15823137? ago
Not so worried about temperature as much as altitude and moisture.
[–] 15823218? ago (edited ago)
Let's nail down these numbers. It's science. Your hypothesis seems to be:
"A plane flying at X altitude with Y moisture in the atmosphere will ALWAYS leave a persistent condensation trail in the sky"
Is that correct?
Let's figure out what X and Y are. Then we can analyze statistical data to see if your hypothesis is correct. If we see examples of planes flying at X altitude and the moisture content in the atmosphere is Y but it is NOT leaving a condensation trail, then your hypothesis would appear to be incorrect and something else is causing the trails.