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Old 16th January 2009 | 08:29
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airborne_artist
Red On, Green On
 
Joined: May 2004
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From: Between the woods and the water
Think of low air pressure as a Hoover, moving all the muck and dust away, even in low wind speeds. High pressure is a cushion, pushing down the dust, water vapour etc, and compressing it, close to the surface.
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