Statcoulomb

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. It is a derived unit given by
It can be converted using
The SI unit of charge is the coulomb (C). The conversion between C and statC is:
The number is 10 times the value of the speed of light expressed in meters/second or, in other words, the speed of light in decimeters per second.
Definition and relation to cgs base units.
The statcoulomb is defined as follows: if two stationary objects each carry a charge of 1 statC and are apart, they will electrically repel each other with a force of 1 dyne. This repulsion is governed by Coulomb's law, which in the Gaussian-cgs system states:
where is the force, and are the two charges, and is the distance between the charges. 
In SI units, the parallel statement for the force between two charges is: 
where is the electric constant. The effect of the Gaussian-cgs definition is to fold the "" factor into the definition of the statcoulomb by setting it equal to unity in terms of length, mass, and time; which results in the Gaussian unit of electric charge possessing the cgs dimensions of L3/2 M1/2 T−1.