When more corn starch is added to oobleck, the mixture becomes thicker and more solid. Oobleck is a non-Newtonian fluid, which means its viscosity (or resistance to flow) changes when force is applied. Adding more corn starch increases the concentration of solid particles in the mixture, making it more difficult for the liquid to flow through them. As a result, oobleck becomes more solid and behaves like a solid under certain stresses, but can still flow like a liquid when subjected to slow or gentle forces.
