# Nernst equation

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## Nernst e·qua·tion

(nārnst),the equation relating the equilibrium potential of electrodes to ion concentrations; the equation relating the electrical potential and concentration gradient of an ion across a permeable membrane at equilibrium:

See also: activity (2).

*E*= [*RT*/*nF*] [ln (*C*_{1}/*C*_{2})], where*E*= potential,*R*= absolute gas constant,*T*= absolute temperature,*n*= valence,*F*= the Faraday, ln = the natural logarithm, and*C*_{1}and*C*_{2}are the ion concentrations on the two sides; in nonideal solutions, concentration should be replaced by activity.See also: activity (2).

## Nernst equation

Etymology: Hermann W. Nernst, German physicist, 1864-1941; L,

*aequare,*to make equalan expression of the relationship between the electrical potential across a membrane and the ratio between the concentrations of a given species of permeant ion on either side of the membrane.

## Nernst e·qua·tion

(nernst ĕ-kwā'zhŭn)The equation relating the equilibrium potential of electrodes to ion concentrations; the equation relating the electrical potential and concentration gradient of an ion across a permeable membrane at equilibrium:

See also: activity (2)

*E*= [RT/nF] [ln (*C*_{1}/*C*_{2})], where*E*= potential,*R*= absolute gas constant,*T*= absolute temperature,*n*= valence,*F*= the Faraday, ln = the natural logarithm, and*C*_{1}and*C*_{2}are the ion concentrations on the two sides; in nonideal solutions, concentration should be replaced by activity.See also: activity (2)

## Nernst,

Walther, German physicist and Nobel laureate, 1864-1941.**Nernst equation**- the equation relating the electrical potential and concentration gradient of an ion across a permeable membrane at equilibrium.

**Nernst potential**

**Nernst theory**- that the passage of an electric current through tissues causes a dissociation of the ions.

## Nernst equation

gives the amplitude and sign of the electronic potential created when a semipermeable membrane separates charged ions.

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