The Sound of a “Perfect” Fluid

Physicists at MIT captured the sound of a “perfect fluid” Using the laws of quantum mechanics, the fluid lows with the smallest amount of friction.

via MIT

This recording is a product of a glissando of sound waves that the team sent through a carefully controlled gas of elementary particles known as fermions. The pitches that can be heard are the particular frequencies at which the gas resonates like a plucked string.

The researchers analyzed thousands of sound waves traveling through this gas, to measure its “sound diffusion,” or how quickly sound dissipates in the gas, which is related directly to a material’s viscosity, or internal friction.

Read more.


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