Why does the water in the toilet bowl always turn left

This is related to the gravitational pull of the earth, in the northern hemisphere underwater leak is counterclockwise rotation, in the southern hemisphere underwater leak is instantaneous clockwise rotation, at the equator water is directly into the sewer, this has been done by someone has done such an experiment.

Left in the Northern Hemisphere and right in the Southern Hemisphere (in the detective book), it is related to the rotation of the Earth.

This is not a certainty and can change direction.

However, due to the rotation of the Earth, the leak in the Northern Hemisphere rotates counterclockwise, and the Leak in the Southern Hemisphere rotates instantaneously.

The toilet bowl will be designed at a certain angle when flushing, which is conducive to using less water and trying to clean the stolen goods in the toilet.

You can do your own experiment, put potassium permanganate in the toilet bowl (the focus is to see the dyeing), flush with water, and then put a statistical amount of potassium permanganate, use a bucket of water with more water than the water in the tank, directly and quickly go down, although it is also counterclockwise rotation, but the effect of extraction is worse than a small amount of flushing out of the tank.