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The statcoulomb (statC) or franklin (Fr) or electrostatic unit of charge (esu) is the physical unit for electrical charge used in the centimetre-gram-second (cgs) electrostatic system of units. The SI system of units uses the coulomb (C) instead. The conversion is 1 statC = 0.1 Am/c ≈ 3.33564 C<br /> The conversion factor (≈ 3.33564) is equal to 10 divided by the numerical value of the speed of light, c, expressed in cm/s.