Tornado in a bottle!You will need
- A clear plastic bottle with a cap (that won't leak)
- Glitter or something that can be seen when spinning
- Washing up liquid
Fill the bottle about three quarters full, and then add a few drops of washing up liquid. Put in a pinch or so of glitter so you will be able to see the tornado better, and put the cap on tightly. Spin the bottle in a circular motion to see if you can see the mini tornado forming in the water. You may need to try it a few times before it works. Explanation
Spinning the bottle in a circular motion creates a water vortex which looks like a tornado. The water is rapidly spinning around the centre of the vortex due to centripetal force (an inward force directing an object or fluid such as water towards the centre of its circular path).