Water and Bonding--Make the Colors Dance
Carlos Olivo, 9-12 Teacher
I used this one to teach about surface tension and bonds and just to amaze my kids.
- a dish
- four different colors of food coloring
- liquid dishwashing soap
It can get messy so do this in or near a sink!
- Pour some milk into a dish (a small saucer will do).
- Put one drop of food coloring anywhere on the milk, but not in the center of the dish.
- Repeat this with the other three colors, making sure not to get the other colors too close to one another.
- Now carefully drop one drop of dishwashing soap in the center of the milk and watch what happens. The more fat in the milk the more effective the results.
- The colors should start swirling all around the milk in the dish as the bonds in the fat are broken up by the soap.