Originally posted by Bobs_Hardware
you go find me one untainted sink that flows clockwise over there in the US and then get back to me..
you are dead wrong on this one trog
the design of the sink only comes into play if it was, say.. speciifically designed to flow in a particular direction, if they are made just for regular sink activities (if anyone has ever listened to Henry Rollin\'s stand up, insert masturbation joke here) then they all flow in one direction up there, and the other direction down here..
No dude, I\'m right. Problem is the "Myth of the Coriolus" is son ingrained in everyone that it\'s hard to let go. Chew on this while I go get some numbers. . . (Make sure to click the link)
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PudKlamp: Basically, although the coriolis effect is noticeable in such large scale patterns as the way that winds in hurricanes/cyclones rotate (clockwise in the Southern Hemisphere and anti-clockwise in the Northern), it is never going to be noticeable in a small experiment with a kitchen sink.
PudKlamp:
http://www.jgeorge.com/coriolis.html PudKlamp: am I?
BushMeister70: Mmm..
BushMeister70: It turns out that even a toilet a mile wide might still be too tiny to exhibit Coriolan tendencies -- the water simply isn\'t hovering over enough latitudes to feel The Force. It takes a mass of air many miles in diameter to demonstrate the infamous toilet twirl, and even then, Coriolis is often foiled by friction with the ground and barometric high jinks.
So while all of this spinning and shoving can help explain prevailing winds and other large-scale phenomena, the twirl in your toilet is determined by jets of water filling the bowl, the shape of the drain, or, for those who cannot let this myth go -- and I\'ve encountered many of them -- the Coriolis Fairy.
PudKlamp: Your first respondent was right: the Coriolis effect governs it, and it is a myth. The Coriolis effect can govern the swirling of fluid flows, and where it does, the swirling is opposite in opposite hemispheres. However, it is only appreciable on a very large scale. Hurricanes obey it: tornadoes, which are much smallers, do not, and neither do kitchen sinks, which are much smaller still.