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Re: OT!! RE: [OM] Notes on the road

Subject: Re: OT!! RE: [OM] Notes on the road
From: "W. J. Liles" <wliles@xxxxxxxxx>
Date: Thu, 30 Dec 1999 17:54:59 -0600
Acer V wrote:
> 
> <snip>
> Jerry, condensation? On one hand, it makes sense (how else would "vapor"
> be visible?), so the reduced air pressure causes the air to cool, which
> causes condensation?

Acer
That's correct.  An expanding gas, in this case air, will cool.  If it
cools below the dew point it will cause the water vapor in the air to
condense.  Air flowing over the top of a wing experiences a drop in air
pressure (that is it expands) and therefore it cools.  The amount of
pressure drop will vary depending on how much lift is being generated. 
At take off and in high speed manoeuvers the pressure drop is greatest
and , therefore, that is when you are most likely to see "vapor" over
and behind the wing and tail surfaces.

Jerry Liles

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