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Old 11th August 2011 | 02:06
  #24 (permalink)  
Bradda G
 
Joined: Aug 2008
Posts: 68
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From: KFRG
I used the following day-to-day observation to help with the density concept during my PPL training:

1. When boiling water, the vapor rises. Therefore, water vapor (aka moisture) must be lighter than dry air.

Just my $0.02
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