Pat Flannery wrote:
[...]
For once and for all, forget the bags of water. Water at cabin
temperature will boil on contact with vacuum, and the bag will explode.
All you are going to end up with is a huge shower of small droplets
spraying all over the airlock's insides as soon as it's depressurized.

I'm not convinced that a gallon ziplock, sealed, in the heavy-duty
gauge, would explode -- the bag would keep the vapor pressure under
control, and the water wouldn't freeze until it had radiated the heat
away, which may take some time.

It isn't until you try to *remove* the water from the bag that you'd
have flash evaporation, so your airlock may be safe, even if you can't
do anything useful with the water.

/dps