posted on Mar, 25 2011 @ 11:58 AM
Based on some of my observations that spaned 2 weeks i noticed why some contrails persist, looking similar to chemtrails.
Based on my 'study' i can mention that SOME contrails last longer in the following conditions: Hith atmospheric pressure 970mmHg or above, high
temperatures at ground level (from ground level to high levels of about 5 km) and extremely low temperatures at plane cruise levels.
For example the
atmospheric pressure now in my region is 1014 mmHg with a temperature of
15C(59F) meaning that the temparature at plane cruise altitude is ~-10C(~14F) and all the planes that pass leave long persistent contrails.
The theory is that because of the low temperatures, the contrails persist longer and they remain at high altitudes longer so because of the air
pressure (it being higher at low altitudes and lower at that altitude) and as they slowly get to lower altitudes they start to disperse.
I would like to mention that these contrails do not make any clouds and do not make the sky look milky and i would also like to mention that this is a
POSSIBLE explanation for SOME 'chemtrails', not all of them.