Originally Posted by markmcfarland
There is another thread on here that says what this is called. It is something like "the vermillion effect". I know that's not the right word but its something like that.
I may be wrong but I believe it is the venturi affect. http://en.wikipedia.org/wiki/Venturi_effect
We use venturi vacuums in the lab back in my grad school days. Each sink has a nozzle that narrowed down to about 1/4" diameter and attached to the side about 4" up was a side adapter for a hose. You could get some really strong vacuums on that side hose with the water running through the faucet full out.