wikipedia: Non-Newtonian fluid
When stressed, this class of fluids begin to behave very strangely indeed: they can get thicker or thinner, some instantly and some over time.
A Non-Newtonian fluid, so named because it’s properties cannot be described in terms of the concepts of classical fluids, can be created easily in the home. This example is a mixture of corn starch and water, roughly 10 parts cornstarch to 1 water.
When stress is applied to the liquid it exhibits properties of a solid. Especially interesting is the reaction when it is disturbed at certain frequencies. Using a frequency generator and a subwoofer, the tub of fluid was placed on top of the subwoofer’s hole, which is emitting sound at 50 hz.
Non-Newtonian Fluid on a Speaker Cone
Corn starch is a shear thickening non-Newtonian fluid meaning that it becomes more viscous when it is disturbed. When it’s hit repeatedly by something like a speaker cone it forms weird tendrils. The video was shot at 30 fps and the speaker cone was vibrating at 30 Hz which is why there is no blur. This is the original video with the actual sound of the speaker.
A pool filled with non-newtonian fluid
They filled a pool with a mix of cornstarch and water made on a concrete mixer truck. It becomes a non-newtonian fluid. When stress is applied to the liquid it exhibits properties of a solid.