Capture a Tornado in a Bottle.
A couple of plastic bottles, some water, and this ingenious device are all students need to create their own tornado in a bottle. The Tornado Tube coupler attaches to two 16oz. 1L or 2L screw-top soda bottles (not included). Rotating water in one of the bottles simulates principles of hydraulics that create tornadoes in nature. A brief explanation of these principles is printed on the package.