"Frank Ch. Eigler" wrote in message
...

"Dan Luke" writes:

How much water is there in 40 gallons of air, Larry? Assume that
when
the airplane was parked, the temperature was 20 C and the air was
saturated (which would be extremely wet conditions, BTW).

An opportunity to disturb high school chemistry knowledge cobwebs!
Water has a 20mb vapour pressure at 20degC, so water would form 2% of
the sea level atmosphere at full saturation. The ideal gas law
indicates there would be about 0.12mol in there, which has a mass of
around 2.2g, which could condense to around 2mL. Not much, but if it
decides to freeze and get sucked in and collected, could it plug up a
fuel line?

Remember that in Larry's example the water is distributed among four
tanks. 2mL split four ways ain't enough to worry about.

If it freezes will it float in avgas or stay on the bottom?
--
Dan
C172RG at BFM