Physical Examples of Divergence Theorem

[Diracster]

Homework Statement

This problem I have been set is to find real life applications of divergence theorem. I have to show the equivalence between the integral and differential forms of conservation laws using it.

2. The attempt at a solution

I have used div theorem to show the equivalence between Gauss' law for electric charge enclosed by a surface S. But can't think or find of another example other than that for Gravity. The problem is that I need to find a different example to Gravity as that is the next question and I can't imagine they would ask the same question twice!
Any suggestions of fields of physics that I can look into would be really helpful. Thanks in advance.

Homework Equations

The Attempt at a Solution

 

[Metaleer]

iirc, Fluid Mechanics heavily uses these integral theorems from Vector Analysis.