Nernst equation
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In electrochemistry, the Nernst equation (named after German physical chemist Walther Nernst) gives the reversal potential of an electrode E, relative to the standard electrochemical potential, E⁰, of the electrode couple or, equivalently, of the half cells of a battery

where R is the universal gas constant, T the temperature in Kelvin, z the charge number or valence of the electrode reaction, and a the chemical activities on the reduced and oxidized side, respectively. F is the Faraday constant, equal to 96,485 C mol^-1.

See also: electrodiffusion.

The original article can be found at: http://en.wikipedia.org/wiki/Nernst_equation.
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