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The statohm is the unit of electrical resistance in the electrostatic system of units which was part of the CGS system of units based upon the centimetre, gram and second.[1]

The static units in that system were related to the equivalent electromagnetic units by a factor of the speed of light. Those units were known as absolute units and so the equivalent of the statohm was the abohm and their proportions were:

1 statohm = c2 abohms = 8.987551787x1020 abohms where c is the speed of light in centimetres per second.

These units are not common now. The SI unit of resistance is the ohm. The statohm is nearly a trillion times larger than the ohm and is the largest unit of resistance ever used in any measurement system.[2] The statohm as a practical unit is as unusably large as the abohm is unusably small.

1 statohm = 8.987551787x1011 ohms[3][4]


  1. ^ Cesare Emiliani (1992), Planet Earth, Cambridge University Press, pp. 11–12, ISBN 9780521409490
  2. ^ H. Arthur Klein, The Science of Measurement: A Historical Survey, p. 448, Courier Corporation, 1974 ISBN 0486258394.
  3. ^ Cardarelli, François (2003), Encyclopaedia of Scientific Units, Weights and Measures, London: Springer, p. 23, ISBN 978-1-4471-1122-1
  4. ^ Ray E. Bolz (1973), CRC Handbook of Tables for Applied Engineering Science, CRC Press, p. 839, ISBN 978-0849302527