Skip to content


Sound-Induced Fluid Metamorphosis

In Short

Imagine a substance that dances between being solid and liquid, behaving like neither. LautStärke explores this using non-Newtonian fluids – materials that transform their state when subjected to pressure. By playing low-frequency sounds through a subwoofer cone, we provoke rhythmic pressure changes. A mixture of starch and water responds, shifting between solid and liquid around 30 times per second, revealing a mesmerizing and dynamic behavior that defies conventional categorization.

Details and Theory

LautStärke delves into the intriguing realm of rheology, focusing on a subset that studies how liquids flow and their viscosity. Unlike water, which remains in its liquid state under pressure, certain substances known as non-Newtonian fluids exhibit behavior that defies intuition. When subjected to pressure, these materials can turn either more solid or more liquid.

In this interactive experiment, a mixture of starch and water is used – a dilatant fluid. By adjusting the mixing ratio just right, this mixture solidifies under even minimal pressure. A subwoofer cone serves as the catalyst. It periodically applies pressure by playing a low-frequency sound. As the sound waves travel through the mixture, its state changes rapidly, oscillating between solid and liquid approximately 30 times per second.

The fascinating part lies in the substance’s response to the sound-induced pressure changes. Depending on factors like mixing ratio, amplitude, frequency, and waveform of the sound, the substance evolves a dynamic behavior that exists somewhere between solid and liquid states. It defies traditional understanding, behaving as if it possesses a unique character of its own.

LautStärke’s mesmerizing demonstration of sound-driven fluid metamorphosis exemplifies the captivating interplay between material properties and the influence of external forces, pushing the boundaries of how we perceive matter’s behavior.