Monday, October 28, 2013

another cloud argument - from contrails

Today I saw a contrail left behind in the sky, with a clean beginning and ending. It was a white line segment against the dawn. Now one end might be because the pilot downshifted, but not both ends of the segment. So, logically, the sharp demarcation at one of the two ends must have been because of a sharp demarcation in the "evaporative environment". But there was noting visible around the contrail - and a pure change in humidity would not have a sharp boundary. 
Increasingly it seems the idea of an amorphous aerosol keeping stuck together because of a physical arrangement of different sized water particles - sounds like nonsense - unsupported by any evidence.

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