Wave Machine

I thought I would occasionally post some Smart Girl Projects. Of course, these are fun for smart boys and parents too. These wave machines can last a long time and are endlessly fascinating for kids!

MATERIALS:

One empty, clear plastic soda bottle, or any large clear plastic bottle with screw on cap
Water
Blue Food Coloring
Mineral oil

CONSTRUCTION:

Fill the bottle 2/3 full with water.
Add blue food coloring, one drop at a time, until the water is
"ocean blue" in color.
Fill the rest of the jar with mineral oil.
Get rid of as any air bubbles as you can and secure lid tightly.
Hold the bottle gently sideways and gently tip it, creating
delightful wave actions.

Note: Sometimes after a lot of rough use, the liquids in the bottle become cloudy.
Set the wave machine aside for a few hours and the liquids will become
clear again.