"RST Engineering" wrote:

No, Dan, you do NOT have all the numbers on your side. Agreed, you
can calculate the amount of water in a saturated sample, but you
cannot do the simple calculations unless you factor in how many
airchanges you get inside of vented tanks in any given amount of time.
I doubt sincerely that you can even estimate, no less calculate, this
factor.

Actually, the tank respiration is fairly simple to calculate by knowing
the high temp.and the low temp and calculating the quantity that would
need to be added to maintain atmospheric pressure in the tank at the
lower temperature. You will find, I believe, that even in extreme
temperatures the air change would be fractional, even after many days.
Remember also that when the air is most humid, the daily high/low temp.
delta is smallest, thus limiting tank respiration when condensation
conditions are optimum.

Can you to supply any empirical evidence for your claims?

Although if you can get me a government contract to study the issue,
I'll be happy to consider doing the consulting work {;-)

Another poster has mentioned an actual experiment by Cessna that failed
to produce any detectable water due to condensation in the tanks. If
anyone has a link to a description of this experiment, please post it.

--
Dan
C172RG at BFM