The unit of electric charge in the centimeter-gram-second electrostatic system of units. That point charge which repels an equal point charge at a distance of 1 centimeter with a force of one dyne.
Sometimes called an escoulomb.¹
For example, see page 387 of:
Members of the Physics Staff of the University of Pittsburgh.
An Outline of Atomic Physics. 2nd Ed.
New York: John Wiley & Sons, 1937.
For an excellent history of the development of the electric and magnetic units up to 1913, see U. S. Bureau of Standards Circular 60.
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Last revised: 8 May 2001.