The unit of capacitance in the centimeter-gram-second electromagnetic system of units. Symbol, aF. One abfarad is the capacitance of a condenser such that a charge of 1 abcoulomb produces a potential difference between the terminals of 1 abvolt. One abfarad = 109 farads.
According to the current national standard in the United States¹, the abfarad is not to be used. The farad should be used instead.
1. IEEE/ASTM SI 10™-2002.
American National Standard for Use of the International System of Units (SI): The Modern Metric System.
New York: IEEE, 30 December 2002.
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: 1 April 2014.