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>     As far as fog in that cave, trying to figure that out, too. Are you
> sure it doesn't form when the surge goes out? that would mean that the volume
> 
> of trapped air was expanding. PV=nRT, so expansion means cooling, and cooling
> 
> means dipping below the dew point.
> 
Okay, it's early (ish) in the morning here, but from your equation if 
V gets bigger, then T gets bigger, ie. ** warming**, not cooling.  
For example, when draining compressed gas cylinders, the cylinder 
gets hot due to the expansion of the gas. I would go with the surge 
theory that compressing the air causes condensation.

Cheers

Bridget Elliott
Department of Zoology
University of Port Elizabeth
Box 1600
Port Elizabeth
South Africa 
6000

phone: +27-41 - 504 2317
fax  : +27-41 -  53 2317
e-mail:ZLBBLE@ZO*.UP*.AC*.ZA*

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