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Rainbow Milk Trick Science Experiment

MattV2099: Guns & Food Follow
  • Video description
  • 7 years ago
  • 66,386 views
  • 1,007 likes
  • 398 comments
Amazing science trick! You need food coloring, dish soap and Milk! Awesome demonstration of how soap breaks surface tension. SteveSpangler explains: Since milk is mostly water, it has surface tension like water. The drops of food coloring floating on the surface tend to stay put. Liquid soap wrecks the surface tension by breaking the cohesive bonds between water molecules and allowing the colors to zing throughout the milk. When you add soap, the weak chemical bonds that hold the proteins in solution are altered. It becomes a free-for-all! The molecules of protein and fat bend, roll, twist, and contort in all directions. The food coloring molecules are bumped and shoved everywhere, providing an easy way to observe all the invisible activity. At the same time, soap molecules combine to form a micelle, or cluster of soap molecules. These micelles distribute the fat in the milk. This rapidly mixing fat and soap causes swirling and churning where a micelle meets a fat droplet. When the micelles and fat droplets have dispersed throughout the milk the motion stops, but not until after you've enjoyed the show!

Magic Milk Instructions
Pour enough milk onto a plate to cover the bottom.
Drop food coloring onto the milk. I made a video so you can see what to expect.
Dip a cotton swab in dishwashing detergent liquid.
Touch the coated swab to the milk in the center of the plate.
Don't stir the milk; it isn't necessary. The colors will swirl on their own as soon as the detergent contacts the liquid.

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