Galvani voltage

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In electrochemistry , galvanic voltage (also internal electrical potential difference ) is understood to mean the difference between the internal electrical potential of two phases . The Galvani potential of a phase is greater, the greater the tendency of the particles to give off electrons.

An example of the Galvani voltage is the difference between the internal electrical potential of an electrode (a solid conductor) and the internal electrical potential of an electrolyte (liquid). Inner potential here indicates that the potential is meant at a point within the phase, not in the vicinity of a phase transition.

Together with the difference in the external electrical potentials, referred to as the volta voltage , the total potential difference between two phases results . The external electrical potential is due to the excess charges of opposite signs at the phase boundaries.

The different types of potential differences play a role in the exact treatment of galvanic cells .

The name goes back to the Italian doctor Luigi Galvani .

In principle, the Galvani voltage can only be measured between phases of the same composition.

Individual evidence

  1. Entry on Galvani potential difference . In: IUPAC Compendium of Chemical Terminology (the “Gold Book”) . doi : 10.1351 / goldbook.G02574 Version: 2.3.1.

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