Translations:Dictionary:Gauss’s theorem/2/en

$\phi =4\pi km=\iint {\textbf {g}}\cdot {\textbf {ds}}=\iint \nabla U\cdot {\textbf {ds}}$ $=\iiint \nabla \cdot {\textbf {g}}dv=4\pi k\iiint \rho dv$.