PREP TIME: 5 MINUTES
EXPERIMENT DURATION: 15 MINUTES
Liquid watercolor paint or food coloring
What's soft like a liquid but holds together like a solid? In this experiment, you will make an easy slime recipe and explore its colloidal properties.
In the bowl, combine equal parts of starch, glue and paint or food coloring. Use your hands to mix it all up. The key to making good slime is mixing it really, really well.
If after a lot of mixing, the slime hasn't formed well, add a small amount of glue and mix some more. If it's still not forming, add a small amount of the liquid starch.
When you use your hands to combine the ingredients, it forms a solid, stretchy blob.
Safety First! Don't taste the slime!
Why It Worked:
Slime is a colloid, or substance that is evenly dispersed through another substance. Your slime has the characteristics of both a solid and a liquid. It moves more slowly than water, yet it is wet, and it slides quickly!
• What do you think would happen if you added more starch to the mix? How about more glue? How would the slime feel and act differently?
Did You Know?
Different types of fluids flow at different rates. This is called their viscosity. For instance, ketchup is much more viscous than water. Slime has an interesting property in that its viscosity isn't always the same. It can change, such as if you add stress. This type of fluid is called a non-Newtonian fluid, and other examples are ketchup, yogurt and mud.
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