Nature.com reports, in Geometric whirlpools revealed – Recipe for making symmetrical holes in water is easy, that it is surprisingly easy to make “holes” in a bucket of water that have all kinds of interesting shapes.
The researchers found that once the plate was spinning so fast that the water span out to the sides, creating a hole of air in the middle, the dry patch wasn’t circular as might be expected. Instead it evolved, as the bucket’s spin sped up, from an ellipse to a three-sided star, to a square, a pentagon, and, at the highest speeds investigated, a hexagon.
Photo credit: T.R.N. Jansson
From talking with my high school aged sons, it sounds like high school science classes have become downright boring. I suspect budgets and fear of liability law suits have chased the hands-on lessons out of the classrooms. That is truly a shame since I fondly remember many experiments from my school physics, chemistry and biology classes. Perhaps this new phenomenon will entertain and educate future generations.
The researchers found that once the plate was spinning so fast that the water span out to the sides, creating a hole of air in the middle, the dry patch wasn’t circular as might be expected. Instead it evolved, as the bucket’s spin sped up, from an ellipse to a three-sided star, to a square, a pentagon, and, at the highest speeds investigated, a hexagon.