Wikidata:Units
This is a page for giving whatever information is available about storing units in Wikidata. Beyond units, Wikidata needs to express similar concepts like numeric datatype, scientific notation, and descriptions of uncertainty in data.
Units list edit
Each unit (unit of measurement (Q47574)) is related to physical properties (physical quantity (Q107715)).
The SI units (SI base unit (Q223662)) are green colored.
Spatial dimensions edit
Length (length (Q36253)) edit
Area (area (Q11500)) edit
Unit | With prefixes | Corresponding properties |
---|---|---|
square metre (Q25343) | square kilometre (Q712226) | area (P2046), watershed area (P2053), wing area (P2112) |
square centimetre (Q2489298) | ||
square millimetre (Q2737347) | ||
are (Q185078) | hectare (Q35852) |
Volume (volume (Q39297)) edit
Time (time (Q11471)) and frequency (frequency (Q11652)) edit
Quantities with unit of time represent a duration or time interval. To use a value representing a point in time (e.g. a date), use of time value is recommended.
Time interval (time interval (Q186081)) edit
Frequency (frequency (Q11652)) edit
Unit | With prefixes | Corresponding properties |
---|---|---|
hertz (Q39369) | kilohertz (Q2143992) | frequency (P2144) |
megahertz (Q732707) | ||
gigahertz (Q3276763) |
Matter edit
Mass (mass (Q11423)) edit
Density (density (Q29539)) edit
Unit | With prefixes | Corresponding properties |
---|---|---|
kilogram per cubic metre (Q844211) | gram per cubic centimetre (Q13147228) | density (P2054) |
Concentration (concentration (Q3686031)) edit
Thermodynamics edit
Temperature (temperature (Q11466)) edit
Pressure (pressure (Q39552)) edit
Thermal capacity (heat capacity (Q179388)) edit
Unit | With prefixes | Corresponding properties |
---|---|---|
joule per mole kelvin (Q20966455) | specific heat capacity (P2056) |
Thermal conductivity (thermal conductivity (Q487005)) edit
Unit | With prefixes | Corresponding properties |
---|---|---|
watt per metre kelvin (Q1463969) | thermal conductivity (P2068) |
Mechanics edit
Speed (speed (Q3711325)) edit
Unit | With prefixes | Corresponding properties |
---|---|---|
kilometre per hour (Q180154) | speed (P2052), speed of sound (P2075) | |
metre per second (Q182429) | kilometre per second (Q4220561) | |
knot (Q128822) |
Kinematic viscosity (kinematic viscosity (Q15106259)) edit
Unit | With prefixes | Corresponding properties |
---|---|---|
stokes (Q1569733) | kinematic viscosity (P2118) | |
square metre per second (Q3332099) |
Electromagnetism, optics edit
Electrical conductivity (electrical conductivity (Q4593291)) edit
Unit | With prefixes | Corresponding properties |
---|---|---|
ampere per volt metre (Q20966435) | electrical conductivity (P2055) |
Luminosity (luminosity (Q105902)) edit
Unit | With prefixes | Corresponding properties |
---|---|---|
solar luminosity (Q843877) | luminosity (P2060) |
Chemistry edit
Enthalpy (enthalpy (Q161064)) edit
Unit | With prefixes | Corresponding properties |
---|---|---|
joule per mole (Q13035094) | kilojoule per mole (Q752197) | molar fusion enthalpy (P2066), molar enthalpy of vaporization (P2116), combustion enthalpy (P2117) |
kilojoule per kilogram (Q21077849) |
Currency (currency (Q8142)) edit
Dimensionless edit
Item | Corresponding properties |
---|---|
infection (Q166231) | number of cases (P1603) |
Reports edit
Discussion list edit
Please add any discussions on this topic to this list -
- Wikidata:Requests for comment/Dimensions and units for the quantity datatype - proposal for which units should be implemented first for the 'number with unit' datatype.
- See the Phabricator tasks at right, and this one
- Wikidata:Project_chat/Archive/2014/09#Quantities_with_units
- Wikidata:Project_chat/Archive/2015/05#Open_for_SI-unit_properties
- Wikidata:Project_chat/Archive/2015/06#Unit-based_properties_-_a_work-around
- Wikidata:Property_proposal/Property_metadata#units_used_for_this_property
- Wikidata:Property_proposal/Generic#conversion_to_standard_unit
- Wikidata:Property_proposal/Generic#standard_unit
- Wikidata:Property_proposal/Generic#conversion_to_SI_base_unit
- "Units are live! \o/" mailing list announcement