How do I use this equation $$ \frac {D}{Dt} (\rho J) = 0$$
to derive the continuity equation
$$ \frac {D}{Dt} \rho \nabla \cdot v = 0$$
How do I use this equation $$ \frac {D}{Dt} (\rho J) = 0$$
to derive the continuity equation
$$ \frac {D}{Dt} \rho \nabla \cdot v = 0$$
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