Scott :
I'm not sure what else to tell you ... the inlet pipe extends down into the
water, while the outlet 'sucks' on the air above the water. When enough
vacuum is drawn, the inlet air is sucked out of the inlet pipe, and bubbles
through the water on it's way to the surface, where it's drawn out by the
vacuum.
FWIW automotive air filters once worked on this principle, some heavy
machinery filters still do. They use oil instead of water though.
Randall
> I'm really telling the truth here--I've never seen the inner workings of a
> bong. how do it work? seems like filtering the air through water would
> be a good way to keep the dust down.
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