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A capital E with a nought superscript, in volts.
Also known as: Standard reduction potential, E nought, Standard cell potential
E° is the voltage of a half-reaction measured against the standard hydrogen electrode, whose potential is defined as zero by convention rather than measurement. Every tabulated value is therefore relative, and only differences between them are physically meaningful.
Denotes the potential of a half-cell under standard conditions, relative to the standard hydrogen electrode.
Contexts: Laboratory
Rests on a convention: the hydrogen electrode is assigned zero volts by definition, so all values are relative and only differences are measurable.
Contexts: Laboratory
Predicts the direction of a redox reaction but not its rate, exactly as a Gibbs energy change does.
Contexts: Laboratory
A capital letter E carrying a small raised circle to its upper right, sometimes struck through.