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Sound is a compression wave not a shear wave, so the viscosity of the liquid has no (direct) effect on it. The speed of sound in a liquid is given by: $$ v = \sqrt{\frac{K}{\rho}} $$ where $K$ is the bulk modulus and $\rho$ is the density. The viscosity does not appear in this equation. A quick Google found data on the speed of sound in liquid helium in ...


Superfluid helium finds an application as a coolant in superconducting systems (http://link.springer.com/chapter/10.1007%2F3-540-45542-6_4#page-1 )

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