In everyday life, designing spaces that both let air flow and absorb sound can be a tricky balancing act. Usually, materials that allow air to pass through—like vents—also let sound escape, making it ...

“We broke Mach 1!” the students exclaimed, partly in triumph, partly in relief. The speed of sound is 343 meters per second, or about 761 mph. The students had just broken the sound barrier — with a ...

The research team from The University of Hong Kong presented their findings at the Phononics 2025: 7th International Conference on Phononic Crystals/Metamaterials, Phonon Transport, Topological ...