Originally Posted by
HazelNuts39
Mr Optimistic,
Isn't Coriolis responsible for that? Or is it viscosity?
I also seem to remember it was Coriolis. But in contrast to popular belief not due to rotation of the Earth.
IIRC it is simply that any existing rotation in the water amplifies due to the small size of the outlet compared to the radius of the bath tub thus increasing the rate ot rotaton when approaching the outlet.