A water tornado is a rotating column of water that can be created by swirling two bottles of water around each other. The tornado will form in the space between the two bottles and will rotate faster as the bottles are moved closer together. To create a water tornado, you will need:
-Two clear plastic soda bottles with screw-on lids
-Water
-Food coloring (optional)
1. Fill both bottles about halfway with water. If you want to add color to your tornado, add a few drops of food coloring to one or both of the bottles.
2. Screw the lids onto the bottles tightly.
3. Hold one bottle in each hand, with the mouths of the bottles touching each other so that they form an X shape. 4. Start swirling the bottles around each other in a clockwise motion. As you swirl, the liquid inside the bottles will start to spin and form a vortex (or whirlpool). 5. Continue swirling until a waterspout forms in between the twobottles. The more you swirl, the faster the waterspout will rotate! 6. To end your experiment, simply stop swirling and let go of one ofthe bottles (it doesn't matter which one).