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Reduction Potential

(Eh, ORP, pE, Redox Potential, Oxidation/Reduction Potential)
(measure of a chemical species' tendency to acquire electrons)

Reduction Potential (or Redox Potential, Oxidation/Reduction Potential, ORP, pE, or Eh) is the tendency of a Chemical Species (atom or molecule) to acquire electrons, i.e., Reduction such as in a Redox reaction.

For Earth use, a Standard Reduction Potentials are measured and recorded using a specific set of conditions to represent a plausible Earth-bound situation. A reduction potential depends upon factors such as Temperature and pressure.


(chemistry)
http://en.wikipedia.org/wiki/Reduction_potential

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