Why does water going down a plughole create a vortex?

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Dudley

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Dudley asked the Naked Scientists:
   
Why does water going down a plughole create a vortex? And does it go in the other direction in the southern hemisphere?

What do you think?
« Last Edit: 30/09/2011 13:01:13 by _system »

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Offline yor_on

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Why does water going down a plughole create a vortex?
« Reply #1 on: 02/10/2011 11:50:43 »
Well, I would guess it's a effect created by the direction, pressure, etc of the water tap, combined with the shape of the container in which it drains. And if it so it should be possible to construct a container where there is no discernible vortex. And the Coriolis effect surely exist but have its greatest importance at large weather systems, not tornadoes, and ballistic missiles. For so small things as your bathtub it should be very difficult to see.
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