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Activity Time: 30 minutes
Recommended Grade: 2 and up
Objectives: Investigate whether slime is a solid or a liquid in this experiment to explore observable properties.
Both silly putty and slime are considered non-Newtonian fluids, which means they have properties of both solids and liquids. That was probably why you may have had some trouble deciding on which one best described it. As you may have seen in your experiments, slime acts more like a solid when a fast force acts upon it. This can be seen when we smack it, punch it, or press on it quickly and then let go. However, it acts more like a liquid when a slow pressure is placed on it. So your penny may have sunk into the slime and your finger may be able to make a big dent in the slime when you press and hold for just a few seconds versus if you press really hard and then let go. Do you think we could walk across a pool of slime? That would be a lot of fun!