Mini Pool Vortex Rings скачать в хорошем качестве

Mini Pool Vortex Rings

After watching Physics Girl's awesome "Crazy Pool Vortex Rings" video [   • Crazy pool vortex  ] I just had to scale this down for kids without a pool to try at home. Be sure to watch her video first- her graphics and explanation are excellent. These are actually traveling water vortex half-rings (also known as Falaco Solitons), just like smoke or fog rings in air (or check out our video to see how to do this with a plastic soda bottle and dry ice:    • Shoot Cloud or Fog Rings with a Soda Bottl...  ). To make water vortex rings inside all you need is a fairly large pan or tub you can fill with water, a spoon and a light bulb. The larger and deeper your tub, the bigger the rings you can make. An overhead light bulb makes it easy to see the dimples created at the water-air boundary as Snell projections (dark spots) on the bottom of the tub (you can also do it outside if the sun is overhead). With a little practice and experimentation you will master the dipping/dragging technique and easily produce vortex rings that persist for several seconds and travel across your tub. You can even perform tricks like shooting one ring through another, or making the ring disappear then reappear as shown in the video.