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${\frac {\partial ^{2}P}{dx^{2}}}=\left({\frac {\rho }{k}}\right){\frac {\partial ^{2}P}{\partial t^{2}}}$

or ${\frac {\partial ^{2}\rho }{dx^{2}}}=\left({\frac {\rho }{k}}\right){\frac {\partial ^{2}\rho }{\partial t^{2}}}$

where *P*=pressure, ρ=density, *k*=bulk modulus.

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