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== Derivation <sup>[3]</sup>==

For a one dimensional system as described in '''Figure 1''', with a specie concentration, <math>C</math> following relations can be made to relate flux in, <math>J_{in}</math> , flux out,<math>J_{out}</math> and control volume <math>V</math>. From this system, the Péclet number can be derived.

[[Image:For_Wiki_page.jpg|150px|right|thumbnail|'''Figure 1''' This is an illustration of a control volume with fluxes in and fluxes out. If sources and sinks can be neglected, these fluxes can be contributed to convection and diffusion ]]