Going with the flow: a sensor that twists and shouts yields precision; not just for draining bathtubs, the Coriolis effect brings flow to the masses--and vice versa. (how it works).

EDN | June 26, 2003| | Copyright

MOST PEOPLE WAVE HEARD that bathtubs drain clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere, due to the Coriolis force. This effect is hard to set up as a valid experiment, due to practical challenges (Reference 1). The same force is responsible for the curvature of the path of projectiles and rockets, as well as the rotational direction of hurricanes and swirling air currents in the Earth's atmosphere. Its effects can be large or subtle.

The force is named after French mathematician Gustave Gaspard Coriolis, who showed in the ...

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