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Speed of Sound in a Liquid (Static Fluid Wave Speed)

In a fluid at rest, the wave speed of a fluid is equivalent to the speed of sound in the same medium, whether liquid or gas.

The speed of sound is calculated from the *Newton-Laplace equation*:

(1)

Where c = speed of sound, K = bulk modulus or stiffness coefficient, ρ = density.

Where a pressure wave passes through a liquid contained within an elastic vessel, the liquid’s density and therefore the wave speed will change as the pressure wave passes. This is commonly experienced as *water hammer*.

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