# Statcoulomb

esufranklinelectrostatic unitFranklin (unit)statC
The statcoulomb (statC) or franklin (Fr) or electrostatic unit of charge (esu) is the physical unit for electrical charge used in the esu-cgs (centimetre–gram–second system of units) and Gaussian units.wikipedia
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### Gaussian units

Gaussiancgs-Gaussian unitsGaussian-cgs units
This repulsion is governed by Coulomb's law, which in the Gaussian-cgs system states:
On the other hand, in Gaussian units, the unit of electrical charge (the statcoulomb, statC) can be written entirely as a dimensional combination of the mechanical units (gram, centimetre, second), as:

### Centimetre–gram–second system of units

CGScgs unitsCGS unit
The ESU unit of charge, franklin (Fr), also known as statcoulomb or esu charge, is therefore defined as follows: "two equal point charges spaced 1 centimetre apart are said to be of 1 franklin each if the electrostatic force between them is 1 dyne."

### Coulomb

CPicoCoulomBExacoulomb

### Coulomb's law

Coulomb forceelectrostatic forceCoulomb interaction
This repulsion is governed by Coulomb's law, which in the Gaussian-cgs system states:

### Unit of measurement

unitunits of measurementweights and measures

### Electric charge

chargeelectrical chargecharged
Performing dimensional analysis on Coulomb's law, the dimension of electrical charge in cgs must be [mass] 1/2 [length] 3/2 [time] −1.

### Speed of light

clight speedspeed of light in vacuum
The number is 10 times the value of the speed of light expressed in meters/second.

### Dyne

dyndyne-centimeters
The statcoulomb is defined as follows: if two stationary objects each carry a charge of 1 statC and are 1 cm apart, they will electrically repel each other with a force of 1 dyne.

### Dimensional analysis

dimensiondimensionsdimensionally equivalent
Performing dimensional analysis on Coulomb's law, the dimension of electrical charge in cgs must be [mass] 1/2 [length] 3/2 [time] −1.

### International System of Units

SISI unitsSI unit
(This statement is not true in SI units; see ).

### Fine-structure constant

fine structure constant137coupling constant
In electrostatic cgs units, the unit of electric charge, the statcoulomb, is defined so that the Coulomb constant,

### Benjamin Franklin

Ben FranklinFranklinFranklin, Benjamin
The CGS unit of electric charge has been named after him: one franklin (Fr) is equal to one statcoulomb.

### Debye

DCoulomb-metre
It is defined as 1 statcoulomb-centimeters.

### Electromotive force

EMFelectromotive force (EMF)
Electromotive force in electrostatic units is the statvolt (in the centimeter gram second system of units equal in amount to an erg per electrostatic unit of charge).

### List of scientific units named after people

Scientific unitsScientific units named after people

### Roentgen (unit)

roentgenröntgenroentgens
The roentgen has its roots in the Villard unit defined in 1908 by the American Roentgen Ray Society as "the quantity of radiation which liberates by ionisation one esu of electricity per cm 3 of air under normal conditions of temperature and pressure."

### Buckingham (unit)

buckinghambuckinghams
It is defined as 1 statcoulomb-centimetre 2.

### Bond dipole moment

dipole momentdipole momentspolarity
Bond dipole moments are commonly measured in debyes, represented by the symbol D, which is obtained by measuring the charge \delta in units of 10 −10 statcoulomb and the distance d in Angstroms.

### Abampere

Bibiot
In these other systems, the abampere is not one of the units; the "statcoulomb per second" or statampere is used instead.