June 9, 2015

The Coriolis Effect

You've heard this, no doubt. Toilets, and drains in general, empty in opposite directions in the northern and southern hemisphere. There's at least one reputable science channel on YouTube that says this is nonsense. Yet it's an undeniable fact hat hurricanes rotate in opposite directions in Earth's two hemispheres.

Two YouTube channels on science, Smarter Every Day and Veritasium, have teamed up to perform a controlled experiment. Performing the same procedure at the same latitude in both hemispheres, they demonstrate that the Coriolis effect is real and explain why the results in your toilets and sinks might vary.

Northern Hemisphere by Smarter Every Day

Southern Hemisphere by Veritasium


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