The substance that defies the rules of solid and liquid
In short: Most matter follows predictable rules: solids hold their shape, while liquids flow. But some substances occupy a strange middle ground. By mixing simple kitchen ingredients, you can create a substance that behaves like a solid one moment and a liquid the next, challenging our basic definitions of physical states.
Matter is defined by the space it occupies. While we typically categorize things as solids, liquids, or gases, some substances blur these boundaries. For example, water is a classic example of a substance that can exist in all three states—solid ice, liquid water, and gaseous vapor—depending on its environment and temperature. You can see this in how a bathtub of water takes up too much space to drink, while a grain of sand fits in your hand. Air also occupies space, filling a balloon until it eventually explodes from the pressure.
The 'Mystery Matter' experiment explores a specific physical reaction using cornstarch and water. Under a microscope, a single grain of cornstarch is a solid with a definitive shape. However, when mixed with water in specific proportions, it creates a substance that reacts uniquely to physical force. The experiment uses two bags of cornstarch, a common cooking material used for making gravy or pudding. This powder serves as the primary solid component for the reaction.
If too much liquid is added, the mixture simply becomes a standard liquid, losing its unique properties. The goal of this experiment is to find the precise balance where the powder and water interact to create a non-Newtonian behavior. This requires patience and careful measurement, as the reaction is highly sensitive to the ratio of solids to liquids. To observe this clearly, the mixture can be colored with food dye—such as blue—and stirred to create a vortex, allowing the viewer to see the substance transition between states of matter in real-time. The process is notoriously messy, so it is recommended to wear an apron and cover the workspace. You should avoid doing this over a rug because the mixture can be difficult to clean.
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Sources
- Summary by Intellect · source: How to Make Mystery Matter | Science Projects
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