Whirlpools spin in the same direction in both hemispheres. In the Northern Hemisphere, whirlpools rotate counterclockwise, while in the Southern Hemisphere, they rotate clockwise. This is due to the Coriolis effect, which is a force that deflects moving objects to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

The Coriolis effect is caused by the rotation of the Earth. As the Earth rotates, it creates a force that acts on moving objects. This force is proportional to the velocity of the object and the sine of the latitude. The Coriolis effect is strongest at the poles and weakest at the equator.

In the Northern Hemisphere, the Coriolis effect deflects moving objects to the right. This means that a whirlpool that is rotating clockwise will be deflected to the right, causing it to rotate counterclockwise. In the Southern Hemisphere, the Coriolis effect deflects moving objects to the left. This means that a whirlpool that is rotating counterclockwise will be deflected to the left, causing it to rotate clockwise.

The Coriolis effect is also responsible for the direction of the winds and ocean currents. In the Northern Hemisphere, the winds and ocean currents rotate counterclockwise, while in the Southern Hemisphere, they rotate clockwise.