Speed of sound
Speed of sound in liquids

In a fluid, the only non-zero stiffness is to volumetric deformation (a fluid does not sustain shear forces).

Hence the speed of sound in a fluid is given by c f l u i d = K ρ, {\displaystyle c_{\mathrm {fluid} }={\sqrt {\frac {K}{\rho }}},} where K is the bulk modulus of the fluid.
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