V katero smer se bo vrtela voda v odtoku na južni hemisferi?

    Derek Muller ustvarjalec znanstvenega video kanala Veritasium in Destin Sandlin ustvarjalec serije Smarter Every Day sta izvedla skrbno načrtovan preizkus dobro znane domneve, da se bo voda, ki odteka v odtok, na južni polobli zaradi Coriolisove sile začela vrteti v drugo smer kot na severni. Morala sta se zelo potrditi, da sta odstranila vse motnje, ki sicer vplivajo na smer kroženja vode. Poskus sta večkrat ponovila in vsakič dobila enak rezultat. Zaključila sta, da v primeru, če imamo dovolj velik rezervoar vode (recimo otroški bazen), ki ga pustimo mirovati vsaj en dan, bomo pri iztekanju vode lahko zaznali Coriolisov učinek. Na severni polobli se bo voda začela vrteti v nasprotni smeri urinega kazalca, na južni polobli pa v smeri gibanja kazalca na uri.

    The idea that water going down a drain or flushed down a toilet swirls in opposite directions in the Northern and Southern Hemispheres has a long history. But few have ever done the experiment. Destin from Smarter Every Day and I performed identical experiments in the Northern and Southern hemispheres. What we found is the direction of water swirl in a toilet, sink, or bathtub is determined by other sources of angular momentum. However if the body of water is big enough, e.g. a kiddy pool, and left still for long enough (at least 24 hours), then the Coriolis effect is observable with water swirling counterclockwise in the Northern hemisphere and clockwise in the Southern hemisphere. For the record Destin and I repeated the experiment 3-4 times each in each hemisphere and got the same results every time.