How It Works
The goo acts like a liquid sometimes and a solid sometimes because it is not really either. Instead, the goo is a suspension, meaning that the very fine grains of cornstarch spread throughout the water and are suspended in the water. They do not dissolve in the water. When pressure is applied to the goo, the cornstarch grains are forced closer together and form chains. The water is trapped between the chains, and the result is goo with a more solid structure. When the pressure is released, the goo can flow like a liquid again. The goo is known as a non-Newtonian fluid because Sir Isaac Newton said that viscosity (thickness) of a liquid depends on the liquid’s temperature. But the viscosity of the goo depends on the force being applied to the goo, not on the goo’s temperature.
This one is messy, so be prepared! Be careful not to get the goo in your eyes, and be sure to wash your hands after handling it.
Don’t put your goo down the garbage disposal unless you add PLENTY of water at the same time.