Just add water and a couple of plastic bottles to create your own whirlpools. Learn all about potential and kinetic energy with this fun whirlpool bottle attachment! All you need is just two empty bottles, and you can explore 4 different experiments. Create your own hurricane by swirling liquid in a bottle and flipping it upside down. The motion will make the liquid form a vortex as it passes through the whirlpool tube into the second bottle. This mini experiment is great for the classroom and at home, especially during school holidays. The small size makes them perfect stocking fillers as well as additions to pass the parcel and goodie bags for science-themed parties. Perfect price for kids to buy these with their own pocket money.