The Nernst Equation is an equation that expresses the exact electromotive force of an electrochemical cell in terms of the activities of products and reactants of the cell. The Nernst Equation relates the reduction potential of an electrochemical reaction to the standard electrode potential, temperature, and activities of the chemical species undergoing reduction and oxidation.
Reference Definition by Corrosionpedia.com: The Nernst Equation defines the relationship between cell potential to standard potential and to the activities of the electrically active (electroactive) species. It relates the effective concentrations (activities) of the components of a cell reaction to the standard cell potential. The equation can be used to calculate the cell potential at any moment during a reaction at conditions other than the standard state. In corrosion studies, the equation is used to analyse concentration cells and in the construction of Pourbaix diagrams.
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