In which direction does the water drain in the bath? Detailed answer

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In which direction does the water drain in the bath? Detailed answer

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In which direction does the water in the bath drain?

a) Clockwise.
b) counterclockwise.
c) vertically down.
d) Depends on the circumstances.

Depends on the circumstances. The widely held belief that the water in a bathtub spirals when drained under the influence of the Coriolis force caused by the rotation of the Earth around its axis is erroneous.

Although the Coriolis force does affect large and long-term synoptic situations such as a hurricane or an ocean current, it is too weak to have any effect on domestic sewers. The direction of the drain depends on the shape of the sink, from which side it was filled, as well as on the rotation introduced by the washing process itself or when you pull out the plug.

Of course, if you take a perfectly symmetrical vat with a tiny drain hole and a stopper that you can pull out without disturbing the balance of the water, fill this vat and leave it for a week so that any movement completely subsides, then, in theory, you can notice a very weak Coriolis effect, which in the Northern Hemisphere would have a counterclockwise direction, and in the Southern Hemisphere - clockwise.

Many believed in such a myth thanks to the plot included in one of Michael Palin's programs "From Pole to Pole". It was a film about a showman from the Kenyan city of Nanyuki, who tried to demonstrate the Coriolis effect on different sides of the equator. But even if we assume that such an effect really exists, it is in this film that the direction of circulation just turned out to be exactly the opposite.

Author: John Lloyd, John Mitchinson

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