We have had one of these around the house for years. Our grandchildren, of all ages, love to watch the water swirl from the top bottle to the bottom bottle. Our 2 ½ year old grandson would bring it to one of us, to have us swirl it, over and over again. The first time I saw this principle used in life was when a Marine swirled a bottle of wine into a punch bowl, at a military wedding. It was way cool then, just as cool now. Here is How to Make a Vortex in a Bottle.
2 straight walled, 2 liter bottles with caps
5 minute epoxy (about $4.00 at craft stores)
Small paper cup
½ drill bit
Sand paper, medium grit
Food coloring (your choice of color)
Here is the safety precaution: Be careful when using the drill, the epoxy and the lit candle. If you are a Kid under age 18, have an adult help you with this project. If you are an adult, use common sense when making this project.
Clean the labels off the 2 liter bottles. Leave the white plastic ring on the bottle. It will help hold the caps in place when you are ready to make a vortex.
Use the sand paper to smooth down the tops of the two caps. These caps are not level so try to make them as level as possible. They do not need to be perfect. The sanding isn’t so much as to make the tops smooth, but to rough up the tops so that the epoxy will stick to them.
There are two ways to make the hole between the caps.
1. Using the drill, drill a hole in each cap. Match the holes up and then mix the epoxy in the small paper cup, with the toothpick.