Physicists Confirm the Fascinating Existence of "Second Sound"

Physicists confirm the fascinating existence of "second sound"

MIT researchers observe a “second wave” of heat in superfluid helium, confirming that heat propagates like sound.

Physicists Record Rare ‘Second Sound’ Phenomenon in Breakthrough Experiment

In a breakthrough that challenges conventional physics, scientists have confirmed the existence of “second sound” — a phenomenon where heat travels as a wave rather than dispersing slowly, as it does in everyday materials. The findings, published in arXiv, stem from high-precision experiments with superfluid helium, a quantum liquid known for its ability to flow without viscosity. Unlike the familiar heat diffusion process that gradually evens o…