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Does Water Swirl the Other Way in the Southern Hemisphere?
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.
This Veritasium video inspired me to go and do some more research on the probe that impacted the moon in 2009. Here are some important excerpts I found from the article above on it:
Based on the measurements, the team estimated about 100 kilograms of water in the view of their instruments (the equivalent of about a dozen 2-gallon buckets) in the area of the impact crater (about 66 feet, or 20 meters across) and the ejecta blanket (about 60 to 80 meters across).