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Levich equation
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The Levich Equation models the diffusion and solution flow conditions around a Rotating disk electrode. It is named after Veniamin Grigorievich Levich who first developed an RDE as a tool for electrochemical research. It can be used to predict the current observed at an RDE, in particular, the Levich equation gives the height of the sigmoidal wave observed in rotating disk voltammetry. The sigmoidal wave height is often called the Levich current. The Levich Equation is written as: where IL is the Levich current n is the number of electrons transferred in the half reaction F is the Faraday constant A is the electrode area D is the diffusion coefficient w is the angular rotation rate of the electrode v is the kinematic viscosity C is the analyte concentration Note: To use the equation as written above, certain units must be used with the parameters listed. If revolution per minute are used, a value of 0.201 should be used in place of 0.620. While the Levich equation suffices for many purposes, improved forms based on derivations utilising more terms in the velocity expression are available. [ - ]