I love this experiment and the video! It works because the food coloring is less dense than the milk, so it stays suspended within the fat molecules. When the soap is introduced, it breaks up the fat and spreads it across the surface of the milk pulling the food coloring with it. Kids love seeing the awesome color ripples and will want to do it over and over again! Try using different types of dish soap and different types of milk to see which one has the coolest effects! This experiment can be used to help teach kids the effects of density.
Also check out other Steve Spangler Science videos on his YouTube channel for other great kid friendly science experiments :
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