quality:corruption, linguistic:voice_change
Point mass

Another expression replaces the summation with an integral, I P = ∭ Q ρ (x, y, z) ‖ r ‖ 2 d V {\displaystyle I_{P}=\iiint _{Q}\rho (x,y,z)\left\|\mathbf {r} \right\|^{2}dV}