fourth sound

[¦fȯrth ′sau̇nd]

(cryogenics)

A pressure wave which propagates in helium II contained in a porous material such as a tightly packed powder, and which results entirely from motion of the superfluid component, the normal component being immobilized by its viscosity.

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References in periodicals archive ?

SINGER-songwriter Claire Mooney returns to Huddersfield this month to host her fourth Sound Women event.

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It's the latest concert on the fourth Sound Transmitter tour.

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A fourth sound pulse of each train was analyzed as in D.

Criteria of female mate choice in Drosophila littoralis, D. montana, and D. ezoana

First heart sound was normal with aortic component of second heart sound loud whereas the third and fourth sounds were not audible.

Rupture sinus of valsalva into ventricular septum with complete heart block

"Fourth sounds good, but we've got a very difficult run-in.

Young is far from satisfied with fourth spot for Blues

And fourth sounds a lot better than fifth or sixth.

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