| Definition: | fundamental law stating that Div J__=0, where J__ is four-current density and Div is four-divergence
Note 1 to entry: As a result of the continuity equation, in three dimensions, div →J=div (ρ →v)=dρdt, where →J is electric current density, ρ is volumic electric charge, and →v is the velocity of charge carriers.
Note 2 to entry: The continuity equation expresses the law of charge conservation (see IEV 113-02-10, Note 2 to entry).
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