Gradient of Divergence/Examples
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Examples of Use of Gradient of Divergence
Fluid Density Increase
Let $\mathbf V$ be the velocity of a fluid at a point in a region of space $R$.
We have that $\operatorname {div} \mathbf V$ is the scalar rate of change of density with respect to time.
Hence $\grad \operatorname {div} \mathbf V$ gives the magnitude and direction in space of the greatest rate of increase of the space of the density.
Increase of Electric Charge
Let $\mathbf V$ be an electric force in a given electric field at a point in a region of space $R$.
We have that $\operatorname {div} \mathbf V$ is the space charge density.
Hence $\grad \operatorname {div} \mathbf V$ gives the magnitude and direction in space of the greatest rate of increase of the space of the electric charge at a given point.