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(1) |
\frac{\partial (\rho \, \phi) }{\partial t} + \nabla (\rho \, {\bf u}) = 0 |
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(2) |
\int_V \, \frac{\partial (\rho \, \phi) }{\partial t} \, dV = - \int_V \, \nabla (\rho \, {\bf u}) \, dV = - \int_{\partial V} \, \rho \, {\bf u} \, d {\bf A} |
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