fifth sound

fifth sound

[¦fifth ¦sau̇nd]
(cryogenics)
A temperature oscillation which propagates in helium II contained in a porous material such as a tightly packed powder, where the normal component is immobilized by its viscosity.
References in periodicals archive ?
This is their fifth Sound event and they guarantee lots of great music and a friendly atmosphere.
The fifth sound could be the same or a different sound.
With hindsight, Firth of Fifth sounds exactly like Procul Harum, while the comedy number The Battle of Epping Forest, inspired by a newspaper story about an East End gangsters' turf war, poaches on Viv Stanshall's territory.