Swirl the water in the top bottle until it gets moving in circular motion. At first, very little water flows into the empty bottle at the bottom from the water-filled bottle on top. After you stop swirling the bottles, the water continues to swirl more rapidly. A hole starts to open up in the centre of the water, and the water drains into the bottom bottle. The swirling water resembles a tornado.
Water has weight, it has the potential to make things move.
Once you put water into motion by swirling it, gravity continues to pull it downward. This rotation of water, combined with the pull of gravity, creates a hole in the centre of the water above. The water forms a tornado. Homepage Last modified on Tuesday 8th October 1996. Copyright 1996 Singapore Polytechnic Project.