Making a non-Newtonian fluid at home offers a fascinating glimpse into a substance that defies common expectations. This unique material behaves like a solid when subjected to rapid force, yet flows like a liquid when left undisturbed. Preparing this mixture is a simple, engaging activity.
Understanding Non-Newtonian Fluids
Most familiar liquids, like water, have a constant viscosity, meaning their resistance to flow is consistent. Non-Newtonian fluids, however, exhibit a different characteristic: their viscosity changes in response to applied stress or shear rate. When quick, strong pressure is applied to a cornstarch and water mixture, its particles lock together, causing it to stiffen and act like a solid. Conversely, when pressure is removed or applied slowly, the particles can slide past each other, allowing the substance to flow like a liquid.
Gathering Your Materials
Creating this unique fluid requires just a few common household items. You will need approximately 1.5 to 2 cups of cornstarch and about 1 cup of water. A large mixing bowl and a spoon or spatula for stirring are also necessary. Food coloring can be added for an optional splash of color.
Step-by-Step Creation
Pour 1.5 to 2 cups of cornstarch into your large mixing bowl. Gradually add 1 cup of water, ensuring a slow addition for correct consistency. Begin mixing the ingredients thoroughly with a spoon or your hands.
Initially, the mixture might feel crumbly, but it will thicken as you continue to add water and mix. Aim for a consistency that allows you to stir it slowly like a liquid, yet resists and feels firm when tapped or punched quickly. If the mixture is too runny, add a little more cornstarch. If it becomes too stiff or dry, incorporate a few more drops of water. Continue to balance the cornstarch and water until you achieve a mixture that instantly stiffens under sudden pressure but flows through your fingers when gently handled.
Tips for Success and Safe Handling
Experiment with your non-Newtonian fluid’s unique properties. Try punching it quickly with your fist to feel its solid-like resistance, then slowly allow your fingers to sink into it to experience its liquid state. You can also try rolling a portion of the mixture into a ball in your hands; as long as you keep applying pressure, it will remain solid, but it will melt and flow when you stop.
For cleanup and disposal, avoid pouring the mixture down any drains, as cornstarch can clog pipes. Instead, scrape the bulk of the mixture into a trash can. For storage, place any leftover fluid in an airtight container at room temperature. While it may dry out over time, adding a small amount of water and remixing can often restore its original consistency.