# Tag Info

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 ...