Make a Tornado in a Bottle

Tornadoes are destructive storms are caused by a vortex. You can use the classic “tornado in a bottle” demonstration to explain how a vortex forms.

This demonstration goes well with a weather related activity or just for some STEM fun.

When you get the water spinning just right, the forces will cause a vortex to form. A tornado is another type of vortex.

Materials  

• 1 2 liter soda bottle empty, with cap, clear works best
• 3 tbsp glitter

Instructions 

• Fill the bottle about 3/4 with water.
• Add the glitter.
• Put the cap on the bottle.
• Turn the bottle upside down.
• Move it in a circular motion for about 15 seconds. You should see a vortex form in the water. If not, try again, either a little faster or a little slower.

Notes

It might take a few tries to get the speed correct. You’ll know when you have it.