Q10: Describe what happened when you touched the surface of the milk with the soapy end of the toothpick ?
A: The colors had expanded and made swirls
Q11: What do you think is happening. To the surface tension of the milk when you add the dishwashing soap ?
A: The surface tension is breaking
Q12: If you repeat the experiment using the same milk does it work as well as the first time you did it ?
A: No
Q13: Why do you think this is ?
A: no, because it's already used milk
In this video you will see how the soap reduces the surface tension of the milk by dissolving the fat molecules. The interaction between the two causes a turbulence as the soap breaks down the fat in the milk. The mixture of the two causes the food coloring to swirl.
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