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a general continuity equation can also be written in a "differential form":where
* is divergence,
* is the density of the amount (i.e. the quantity per unit volume),
* is the flux of (i.e. j = ?v, where v is the vector field describing the movement of the quantity ),
* is time,
* is the generation of per unit volume per unit time. Terms that generate (i.e., ) or remove (i.e., ) are referred to as sources and sinks

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