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If I could remeber any pchem or physics, I could make more sense of this. I think there is a cloud or a fog forming in your masks, which happens whenever the temperature of a gas decends below the dew point of the gas for its water content. Kind of a quick and dirty rule of thumb for cloud formation is that the spread between the dew point and temperature drops 1 degree every thousand feet, so if the ground air temp is 70 and the dew point is 60, you'll have clouds forming at 10,000 feet. Similar things happen when moist air blows over the ocean and hits a rise, like a hill on a shoreline. Anyway, for some reason, the gas in your masks momentarily crosses the dew point. Could be that the gasses are literally at different temps, which I think is somewhat unlikely, could be some kind of stochiometric cooling due to mixing, could be some kind of cooling due to the introduction of a gas with a different rate of heat transfer to the outside, could be all those things. The answer's in there somewhere. Like I said, wish I could remember physics. 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. One quick note on glue: Elmer's makes a new kind of glue that is based on clear silicon caulk, but it sets up very nicely into a strong, gap-filling, flexible bond. Worth trying. ------- when life hands you lemons, shoot some tequila. ======================================================= Roger Carlson w 310-812-0430 somewhere off Hermosa Beach, CA f 310-812-1363 roger@ch*.sp*.tr*.co* h 310-frogger =======================================================
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