 Acoustic density perturbation (source code)

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= Acoustic density perturbation
{title2=$\rho'=\rho-\rho_0$}

An acoustic density perturbation is the deviation of fluid <mass density> from its quiescent reference value. In a homogeneous isentropic linear acoustic field, its corresponding <pressure> perturbation is $p'=c_0^2\rho'$. Nonlinear and entropy-dependent departures from this relation enter the <Lighthill stress tensor>.

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