View source for Statmho

The '''statmho''' is the unit of [[electrical conductance]] in the [[Electrostatic units|electrostatic system of units]] (ESU), an extension of the [[centimeter-gram-second]] (CGS) system to cover electrical units. It is sometimes called the '''statsiemens''', with symbol statS.<ref>{{cite web |title=SI Units |url=https://www.qsl.net/g4cnn/units/units.htm |website=web site of G4CNN |access-date=24 February 2024}}</ref>

== Conversion ==
In the ESU system, the [[permittivity of free space]] is set to unity by definition.  This results in unit conversions to the SI system containing a power of the [[speed of light]], ''c'', as well as a power of 10.  In the case of the statmho, the conversion from [[Siemens (unit)|siemens]] (S) is given by:<ref name=Fenna83>Donald Fenna, ''A Dictionary of Weights, Measures, and Units'', pp. 83–84, Oxford University Press, 2002 {{ISBN|0198605226}}.</ref>

:1&nbsp;[[Siemens (unit)|S]] ≘ ''c''<sup>2</sup> × 10<sup>−5</sup> s<sup>2</sup>/m<sup>2</sup> × 1 statmho.

The value of ''c'' in the SI system is {{val|299,792,458}} metres per second exactly by definition. However, in the era in which the ESU system was in use, the speed of light was determined by measurement and was taken to be approximately {{val|29,973,000,000}} centimetres per second.<ref name=Fenna83/>

:1 statmho ≘ 1.112650&nbsp;pS.<ref>Fenna, p. 76</ref>

The sign ≘ denotes 'correspondence' between quantities.  Equality does not apply, since the systems of quantities underlying the two systems of units are mutually incompatible.

==References==
{{Reflist}}

{{CGS units}}

[[Category:Centimetre–gram–second system of units]]
[[Category:Electricity]]


{{Measurement-stub}}