mv3rev 12026-03-17INTERNATIONAL BUREAU OF WEIGHTS AND MEASURES (BIPM); The International System of Units (SI) - 9th editon 2019
metre
0112/2///62720#UAA726
SI unit of length defined by taking the fixed numerical value of the speed of light in vacuum, c, to be 299 792 458 when expressed in the unit m s-1, where the second is defined in terms of the caesium frequency ∆νCs
unitAll properties21#
- Version
- 3
- Revision
- 1
- Preferred name
- metre
- Short name
- m
- Definition
- SI unit of length defined by taking the fixed numerical value of the speed of light in vacuum, c, to be 299 792 458 when expressed in the unit m s-1, where the second is defined in terms of the caesium frequency ∆νCs
- Definition source
- INTERNATIONAL BUREAU OF WEIGHTS AND MEASURES (BIPM); The International System of Units (SI) - 9th editon 2019
- Note
- Base unit of the International System of Units (SI)
- Unit structure
- m¹
- Unit in text
- metre
- Unit in SGML/XML
Structured markup (math)(121 chars)
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <!-- UAA726 --> <mi mathvariant="normal">m</mi> </math>
- UN/ECE code
- MTR
- Unit conversion
Structured markup (UnitsML)(499 chars)
<UnitsML xmlns="https://schema.unitsml.org/unitsml/1.0"><Unit xml:id="0112/2///62720#UAA726"><Conversions><Float64ConversionFrom xml:id="UAA726_from_UAA726" initialUnit="0112/2///62720#UAA726" multiplicand="1" divisor="1" exact="true" /></Conversions></Unit><Unit xml:id="https://si-digital-framework.org/SI/units/metre"><Conversions><Float64ConversionFrom xml:id="SI::metre_from_UAA726" initialUnit="0112/2///62720#UAA726" multiplicand="1" divisor="1" exact="true" /></Conversions></Unit></UnitsML>
- Responsible committee
- IEC/SC 3D
- Publisher
- IEC
- Published in
- IEC 62720
- Status level
- Standard
- Version release date
- 2026-03-17
- Revision release date
- 2026-03-17
- Version initiation date
- 2026-03-17
- Change request ID
- C00192