This page documents an OPTIMADE Unit Definition. See https://schemas.optimade.org/ for more information.
ID: https://schemas.optimade.org/defs/v1.2/units/si/2019/named/siemens
Definition name: siemens
Unit name: siemens
Latin symbol: S
Display symbol: S
Description: A derived SI unit for electrical conductance equal to kg⁻¹·m⁻²·s³·A² using the 2019 SI base units.
"The International Committee will ask the General Conference to approve two special names: [...] siemens (symbol S) for the SI unit of conductance (Ω⁻¹)." [14th CGPM Meeting (1971)].
The siemens was defined at the 14th CGPM Meeting in 1971 and implicitly redefined via the redefinitions of the meter at the 17th CGPM Meeting in 1983, resolution 1 and the kilogram at the 26th CGPM Meeting (2018), resolution 1.
Resources:
JSON definition:
{
"$id": "https://schemas.optimade.org/defs/v1.2/units/si/2019/named/siemens",
"$schema": "https://schemas.optimade.org/meta/v1.2/optimade/physical_unit_definition.json",
"title": "siemens",
"symbol": "S",
"display-symbol": "S",
"description": "A derived SI unit for electrical conductance equal to kg\u207b\u00b9\u00b7m\u207b\u00b2\u00b7s\u00b3\u00b7A\u00b2 using the 2019 SI base units.\n\n\"The International Committee will ask the General Conference to approve two special names: [...] siemens (symbol S) for the SI unit of conductance (\u03a9\u207b\u00b9).\" [14th CGPM Meeting (1971)].\n\nThe siemens was defined at the 14th CGPM Meeting in 1971 and implicitly redefined via the redefinitions of the meter at the 17th CGPM Meeting in 1983, resolution 1 and the kilogram at the 26th CGPM Meeting (2018), resolution 1.",
"resources": [
{
"relation": "Definition at the 14th CGPM Meeting (1971)",
"resource-id": "https://www.bipm.org/en/committees/cg/cgpm/14-1971"
},
{
"relation": "Redefinition of the metre at the 17th CGPM meeting (1983), resolution 1",
"resource-id": "https://www.bipm.org/en/committees/cg/cgpm/17-1983/resolution-1"
},
{
"relation": "Redefinition of the kilogram at the 26th CGPM Meeting (2018), resolution 1",
"resource-id": "https://www.bipm.org/en/committees/cg/cgpm/26-2018/resolution-1"
},
{
"relation": "Wikipedia article describing the unit",
"resource-id": "https://en.wikipedia.org/wiki/Siemens_(unit)"
}
],
"defining-relation": {
"base-units": [
{
"symbol": "A",
"id": "https://schemas.optimade.org/defs/v1.2/units/si/2019/base/ampere"
},
{
"symbol": "kg",
"id": "https://schemas.optimade.org/defs/v1.2/units/si/2019/base/kilogram"
},
{
"symbol": "m",
"id": "https://schemas.optimade.org/defs/v1.2/units/si/1983/base/metre"
},
{
"symbol": "s",
"id": "https://schemas.optimade.org/defs/v1.2/units/si/1967/base/second"
}
],
"base-units-expression": "A^2*kg^-1*m^-2*s^3"
},
"standard": {
"name": "si",
"year": 2019,
"category": "named",
"symbol": "S"
},
"x-optimade-definition": {
"label": "siemens_si_2019_named",
"kind": "unit",
"format": "1.2",
"version": "1.2.0",
"name": "siemens"
}
}