Date:   4/18/2009 7:24:03 PM ( 16 y ago)
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URL:   https://www.curezone.org/forums/fm.asp?i=1399977

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This should help people to understand more clearly. The relative humidity is one factor, and it's not always needed to produce persistant contrails.

http://asd-www.larc.nasa.gov/GLOBE/resources/activities/appleman_student.html

 

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