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In fluid mechanics, the force density is a vector field representing the flux density of the hydrostatic force within the bulk of a fluid. Force density is represented by the symbol f, and given by the following equation, where P is the pressure:
- <math>\mathbf{f} = \nabla P <math>.
The force on a differental volume element dV of the fluid is:
- <math>d\mathbf{F} = \mathbf{f}dV<math>
Thus, the force density at a point in a fluid determines the acceleration of the fluid at that point.
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