https://dx.doi.org/10.1351/goldbook.C01452

The current density of a species where is a vector which indicates the direction in which the charges transported by the species

**B**in a given point of the solution is obtained by multiplying the flux density of that species at the given point by the Faraday constant and by the charge number of the species:**B**flow and which gives the number of these charges going through a plane oriented perpendicular to the vector, divided by time and by area, and is the flux density of a minor constituent of the solution with respect to a fixed frame of reference.See also: electric current density

Source:

PAC, 1981,

*53*, 1827*(Nomenclature for transport phenomena in electrolytic systems)*on page 1833