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Alberto Pepe edited 31367557936267.md
almost 11 years ago
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However one can retain a 1D approximation by re-defining the radius coordinate
as the radius of a sphere containing the same volume $\VP=4\pi \rP^3/3$, which allows to re-write the equation
of continuity in the usual form
\begin{equation}
{\mP}{\rP}{t}=4\pi\rP^2\rho
\end{equation}