On 12/18/2013 10:32 PM, TimR wrote:
On Wednesday, December 18, 2013 11:43:01 AM UTC-5, Irreverent Maximus wrote:
On 12/18/2013 8:25 AM, wrote:





The only way it could happen would be for there to be a vacuum

large enough so that the air from the various vents would not

be sufficient to reduce it enough and there was still enough

vacuum to pull the water from the traps.



Oh, to play the nit picker...



The vacuum does not pull the water. The water is pushed. :-)

Idle speculation: if the vacuum got the water started over the top of the P-trap, a siphon would be created that would not stop until all the water had been removed.


Or, until the trap is empty enough to allow air from above the trap to
pass through. This would break the siphon, and any further water
evacuation would be via venturi like mechanics. A strong enough
air flow could possibly lift ripplets of water and take them away.
Plus, the air flow could increase evaporation.