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Old 02-24-2013, 06:13 PM   #248 (permalink)
gone-ot
...beats walking...
 
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Water vapor is LIGHTER than air, that's why clouds are UP in the sky, not on the ground. It is also why bad (cloudy & rainy) weather is associated with LOW atmospheric pressure (high water vapor in air) and good (clear & dry) weather is associated with HIGH atmospheric pressure (low water vapor in the air).
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