Today, explain to your children that you will mix milk and food coloring without stirring them!
Add 1-2 cups of milk to a pie plate. Let your child add drops of food coloring to the surface of the milk. Next, take a dish-washing liquid such as Dawn, and drop a teaspoon of this liquid into the middle of the milk. The food coloring drops will swirl and begin to mix with the milk in beautiful patterns. Explain that the food coloring floats on the surface of the milk due to the fat molecules creating a flat surface, this surface tension is broken when the grease-fighting dish-washing detergent is added, sending the food coloring swirling.
You can also magically move toothpicks by floating them on the milk in a star pattern before adding the soap.
Add 1-2 cups of milk to a pie plate. Let your child add drops of food coloring to the surface of the milk. Next, take a dish-washing liquid such as Dawn, and drop a teaspoon of this liquid into the middle of the milk. The food coloring drops will swirl and begin to mix with the milk in beautiful patterns. Explain that the food coloring floats on the surface of the milk due to the fat molecules creating a flat surface, this surface tension is broken when the grease-fighting dish-washing detergent is added, sending the food coloring swirling.
You can also magically move toothpicks by floating them on the milk in a star pattern before adding the soap.
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