The unit of electric conductance in the centimeter-gram-second electromagnetic system of units. A conductor has a conductance of 1 abmho when there is a potential difference of 1 abvolt between the ends of the conductor while an unvarying current of 1 abampere flows through it. Symbol, ab or abΩ⁻¹. Renamed the absiemens (symbol, aS). One abmho = 10⁹ siemens.
According to the current national standard in the United States¹, the abmho is not to be used. The siemens 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.
See Section 3.3.3.
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.