Water spirals down the plughole, clockwise or anti-clockwise due to Earth rotation, at Equator is no spiral?
Answers:
That is a myth.
Water goes down the hole the same direction, regardless of hemisphere, due to the physical properties of the device and the natural flow of the water prior to unplugging it.
The Corrialles (spelling) effect plays a very little role in it.
Water will spiral down the plug BOTH WAYS anywhere on the planet.
It depends more on how you take the plug out, and how the water is moving when you takethe plug out, than the earths rotation.
in fact water can spiral different ways down the plug hole at any piont of the the earth, it has more to do with the design of the sink.
The whole question is incorrect. The effect you are describing is a myth, it is irrelevant which side of the equator you are on as to which way water spirals. It is more likely to be determined by the shape of the recepticle and pipes, not the Earth's rotation.
The coriolis effect is not dependent on whether you are north or south of the equator, this is an old wive's tale- although the theory is correct.. The direction of spiral is mainly due to the physical properties of the plughole.
Under laboratory conditions it might be possible to prove this theory but in real life there are too many other factors which can affect the direction of rotation.
As stated, it is more down to the shape of the sink or basin
Yes, but it is very difficult to demonstrate because the Coriolis force is so small, one must go to extraordinary lengths to detect it. But, it has been done. You cannot use an ordinary sink for it lacks the requisite circular symmetry: its oval shape and off-center drain render any results suspect. Those who have succeeded used a smooth pan of about one meter in diameter with a very small hole in the center. A stopper (which could be removed from below so as to not introduce any spurious motion) blocked the hole while the pan was being filled with water. The water was then allowed to sit undisturbed for perhaps a week to let all of the motion die out which was introduced during filling. Then, the stopper was removed (from below). Because the hole was very small, the pan drained slowly indeed. This was necessary, because it takes hours before the tiny Coriolis force could develop sufficient deviation in the draining water for it to produce a circular flow. With these procedures, it was found that the rotation was always cyclonic.
When water goes down a plughole a vortex (spiral) usually forms (it will if the depth of water is significant). The direction of the vortex is influenced by factors such as the design of the basin and how the plug is removed. However an anti-clockwise vortex is more likely in the northern hemisphere and a clockwise one in the southern hemisphere.
If you really wanted to do some research on this then carry around a small notebook with you. Record the vortex direction every time you remove the plug.
It is governed by the same principal as a cyclone or hurricane. It spirals in different directions depending in which hemisphere you are for example hurricanes spin clockwise in the southern hemisphere and anti-clockwise in the northern hemisphere. I further understand that the direction is not governed by the earths rotation but by the magnetic fields surrounding the Poles.
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