Science and beauty combine in the Amazing Milk Experiment, this week’s Maker Monday STEM activity. Little kids will find their giggles watching the moving colors swirl across the milk. Older kids might find the science lesson behind the experiment more fascinating.
All liquids, including milk, contain a property known as surface tension. Surface tension is caused by the cohesive forces of the liquid’s molecules. Soap, when applied to any liquid, will reduce the surface tension. In this experiment, the fat and protein molecules in the milk react to the soap. As the soap and fat molecules work to move together in this chemical reaction, surface tension is decreased. The food coloring allows you to witness this phenomenon as it happens.
It is very cool!
3/4 to 1 cup of milk
Pour enough milk into the pan to cover the bottom. Dot with a variety of food coloring drops.
Add 1 drop of dishwashing liquid and watch the colors swirl.
This color movement will last for a while with more and more intricate and elaborate patterns developing.
Once the movement ends, give the color swirls a little help by twirling and pulling through the colors with a toothpick.
It’s quite a sight to see!
For more Maker Monday projects and other fun stuff for kids, visit the Kidsburgh Activities page.