For instance, what about toothpaste? Actually, some materials can behave both like a solid and like a liquid, depending on how we interact with them. Today, we will do an experiment with corn starch: amazingly, you can gently submerge your hand in it, as if it was a liquid, but if you tap it, it feels hard like a solid! We call materials that.. Toothpaste is a mixture of powdered solids and various liquids, so it's neither a liquid nor a solid. Chemists would argue that toothpaste is a colloid (like milk or ink): a mixture where tiny particles of one substance are dispersed evenly into another without separating out. Find the answer to more baffling questions in How It Works magazine.

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The Science Behind Toothpaste's Viscosity. Toothpaste's unique viscosity stems from its complex composition. It contains a mixture of solid particles, such as abrasives and fluoride compounds, suspended in a liquid base.The solid particles create a network of interactions that give toothpaste its semi-solid consistency.. Factors Influencing Toothpaste's Viscosity. In our investigations we have used our knowledge of solids and liquids to observe and record the changes that happened when they are mixed together, but what.