http://qudt.org/schema/qudt/PhysicalConstant
<p>A <em>Physical constant</em> is a physical quantity that is generally believed to be both universal in nature and constant in time.
It can be contrasted with a mathematical constant, which is a fixed numerical value but does not directly involve any physical measurement.
</p>
<p>There are many physical constants in science, some of the most widely recognized being:
the speed of light in vacuum c, Newton's gravitational constant G, Planck's constant h,
the electric permittivity of free space ε0, and the elementary charge e.
</p>
<p>Physical constants can take many dimensional forms, or may be dimensionless depending on the system of quantities and units used.
</p>
Instances of qudt:PhysicalConstant can have the following properties:
| PROPERTY | TYPE | DESCRIPTION | RANGE |
|---|
By the associated SHACL property shapes, instances of qudt:PhysicalConstant can have the following properties:
| PROPERTY | PROPERTY TYPE | DESCRIPTION | MIN | MAX | VALUE TYPE | OTHER CONSTRAINTS | GLOBAL RANGE |
|---|---|---|---|---|---|---|---|
| qudt:PhysicalConstant | |||||||
| qudt:altSymbol | rdf:Property | An alternative symbol | 0 | * | -- | ||
| qudt:applicableSystem | rdf:Property | This property relates a unit of measure with a unit system that may or may not define the unit, but within which the unit is compatible. | 0 | * | qudt:SystemOfUnits | -- | |
| qudt:applicableUnit | rdf:Property | <p>See this page on the QUDT GitHub<a href="https://github.com/qudt/qudt-public-repo/wiki/Advanced-User-Guide#4-computing-applicable-units-for-a-quantitykind">Wiki</a> on how "qudt:applicableUnit" is computed from "qudt:hasQuantityKind" and then materialized. </p> | 0 | * | qudt:Unit | -- | |
| qudt:dbpediaMatch | rdf:Property | 0 | * | xsd:anyURI | -- | ||
| qudt:eclassCode | rdf:Property | Provides an IRDI (International Registration Data Identifier) that identifies the corresponding definition in the ECLASS Standard. | 0 | * | xsd:string | -- | |
| qudt:exactConstant | rdf:Property | 0 | * | xsd:boolean | -- | ||
| qudt:hasDimensionVector | rdf:Property | 0 | * | qudt:QuantityKindDimensionVector | -- | ||
| qudt:iec61360Code | rdf:Property | Provides an IRDI (International Registration Data Identifier) that identifies the corresponding definition in the IEC CDD (Common Data Dictionary). | 0 | * | xsd:string | -- | |
| qudt:isoNormativeReference | rdf:Property | Provides a way to reference the ISO unit definition. | 0 | * | xsd:anyURI | -- | |
| qudt:latexDefinition | rdf:Property | 0 | 1 | qudt:LatexString | -- | ||
| qudt:latexSymbol | rdf:Property | The symbol is a glyph that is used to represent some concept, typically a unit or a quantity, in a compact form. For example, the symbol for an Ohm is $ohm$. This contrasts with 'unit:abbreviation', which gives a short alphanumeric abbreviation for the unit, 'ohm' for Ohm. | 0 | * | qudt:LatexString | -- | |
| qudt:mathMLdefinition | rdf:Property | 0 | 1 | xsd:string | -- | ||
| qudt:normativeReference | rdf:Property | Provides a way to reference information that is an authoritative source providing a standard definition | 0 | * | xsd:anyURI | -- | |
| qudt:siExactMatch | rdf:Property | 0 | 1 | -- | |||
| qudt:symbol | rdf:Property | The symbol is a glyph that is used to represent some concept, typically a unit or a quantity, in a compact form. For example, the symbol for an Ohm is $ohm$. This contrasts with 'unit:abbreviation', which gives a short alphanumeric abbreviation for the unit, 'ohm' for Ohm. | 0 | 1 | -- | ||
| qudt:ucumCode | rdf:Property | <p><em>ucumCode</em> associates a QUDT unit with its UCUM code (case-sensitive). </p><p>In SHACL the values are derived from specific ucum properties using 'sh:values'.</p> | 0 | * | qudt:UCUMcs | -- | |
| qudt:Quantity | |||||||
| qudt:hasQuantityKind | rdf:Property | 0 | * | qudt:QuantityKind | -- | ||
| qudt:isDeltaQuantity | rdf:Property | This property is used to identify a Quantity instance that is a measure of a change, or interval, of some property, rather than a measure of its absolute value. This is important for measurements such as temperature differences where the conversion among units would be calculated differently because of offsets. | 0 | * | xsd:boolean | -- | |
| qudt:quantityValue | rdf:Property | 0 | * | qudt:QuantityValue | -- | ||
| qudt:Concept | |||||||
| dcterms:description | rdf:Property | 0 | * | -- | |||
| dcterms:isReplacedBy | rdf:Property | 0 | 1 | -- | |||
dtype:code |
-- | 0 | * | -- | |||
| qudt:abbreviation | rdf:Property | <p>An abbreviation for a unit is a short ASCII string that is used in place of the full name for the unit in contexts where non-ASCII characters would be problematic, or where using the abbreviation will enhance readability. When a power of abase unit needs to be expressed, such as squares this can be done using abbreviations rather than symbols. For example, <em>sq ft</em> means <em>square foot</em>, and <em>cu ft</em> means <em>cubic foot</em>. </p> | 0 | 1 | xsd:string | -- | |
| qudt:deprecated | rdf:Property | 0 | 1 | xsd:boolean | -- | ||
| qudt:deprecatedInVersion | rdf:Property | Version number of the first QUDT release in which an entity was deprecated. | 0 | 1 | xsd:string |
sh:pattern
^\d+\.\d+\.\d+$
|
-- |
| qudt:exactMatch | owl:ObjectProperty | 0 | * | qudt:Concept | -- | ||
| qudt:guidance | rdf:Property | 0 | * | rdf:HTML | -- | ||
| qudt:hasRule | rdf:Property | 0 | * | qudt:Rule | -- | ||
| qudt:id | rdf:Property | <p>The "qudt:id" is an identifier string that uniquely identifies a QUDT concept. The identifier is constructed using a prefix. For example, units are coded using the pattern: "UCCCENNNN", where "CCC" is a numeric code or a category and "NNNN" is a digit string for a member element of that category. </p> <p>For scaled units there may be an addition field that has the format "QNN" where "NN" is a digit string representing an exponent power, and "Q" is a qualifier that indicates with the code "P" that the power is a positive decimal exponent, or the code "N" for a negative decimal exponent, or the code "B" for binary positive exponents. </p> | 0 | 1 | xsd:string | -- | |
| qudt:plainTextDescription | rdf:Property | A plain text description is used to provide a description with only simple ASCII characters for cases where LaTeX , HTML or other markup would not be appropriate. | 0 | * | -- | ||
rdf:type |
-- | 1 | * | -- | |||
| qudt:Quantifiable | |||||||
qudt:datatype |
-- | 0 | 1 |
sh:or
( qudt:Datatype | qudt:EnumeratedValue )
|
-- | ||
| qudt:hasUnit | rdf:Property | <p>This property relates a factor unit to its unit or system of units with a unit of measure that is either: </p> <dl> <dd>a) defined by the system,</dd> <dd>b) accepted for use by the system and is convertible to a unit of equivalent dimension that is defined by the system,</dd> <dd>c) a reference to the unit of measure of a quantity (variable or constant) of interest.</dd> </dl> <p>Systems of units may distinguish between base and derived units. Base units are the units which measure the base quantities for the corresponding system of quantities. The base units are used to define units for all other quantities as products of powers of the base units. Such units are called derived units for the system. </p> | 0 | 1 | qudt:Unit | -- | |
| qudt:relativeStandardUncertainty | rdf:Property | The relative standard uncertainty of a measurement is the (absolute) standard uncertainty divided by the magnitude of the exact value. | 0 | 1 | xsd:double | -- | |
| qudt:standardUncertainty | rdf:Property | The standard uncertainty of a quantity is the estimated standard deviation of the mean taken from a series of measurements. | 0 | 1 | xsd:decimal | -- | |
| qudt:standardUncertaintySN | rdf:Property | The standard uncertainty of a quantity is the estimated standard deviation of the mean taken from a series of measurements. | 0 | 1 | xsd:double | -- | |
| qudt:value | rdf:Property | A property to relate an observable thing with a value expressed as a decimal | 0 | 1 | rdf:first [sh:or qudt:NumericTypeUnion], rdf:rest (sh:property [sh:class qudt:DataItem, sh:path qudt:value], sh:property [sh:class qudt:EnumeratedValue, sh:path qudt:value]) | -- | |
| qudt:valueSN | rdf:Property | A property to relate an observable thing with a value expressed in scientific notation | 0 | 1 | -- | ||
| qudt:Verifiable | |||||||
| qudt:dbpediaMatch | rdf:Property | 0 | * | xsd:anyURI | -- | ||
| qudt:informativeReference | rdf:Property | Provides a way to reference a source that provided useful but non-normative information. | 0 | * |
sh:or
( xsd:anyURI | qudt:Citation )
|
-- | |
| qudt:isoNormativeReference | rdf:Property | Provides a way to reference the ISO unit definition. | 0 | * | xsd:anyURI | -- | |
| qudt:normativeReference | rdf:Property | Provides a way to reference information that is an authoritative source providing a standard definition | 0 | * | xsd:anyURI | -- | |
| qudt:wikidataMatch | rdf:Property | This property relates a QUDT concept to a Wikidata item. The Wikidata item is identified by the Wikidata URI, which is of the form `https://www.wikidata.org/wiki/Q{number}`. | 0 | 1 | -- | ||
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
qudt:PhysicalConstant a rdfs:Class,
sh:NodeShape ;
rdfs:label "Physical Constant" ;
dcterms:description """
<p>A <em>Physical constant</em> is a physical quantity that is generally believed to be both universal in nature and constant in time.
It can be contrasted with a mathematical constant, which is a fixed numerical value but does not directly involve any physical measurement.
</p>
<p>There are many physical constants in science, some of the most widely recognized being:
the speed of light in vacuum c, Newton's gravitational constant G, Planck's constant h,
the electric permittivity of free space ε0, and the elementary charge e.
</p>
<p>Physical constants can take many dimensional forms, or may be dimensionless depending on the system of quantities and units used.
</p>"""^^rdf:HTML ;
qudt:dbpediaMatch "http://dbpedia.org/resource/Physical_constant"^^xsd:anyURI ;
rdfs:isDefinedBy <http://qudt.org/3.5.2/schema/shacl/qudt> ;
rdfs:subClassOf qudt:Quantity ;
sh:property qudt:PhysicalConstant-altSymbol,
qudt:PhysicalConstant-applicableSystem,
qudt:PhysicalConstant-applicableUnit,
qudt:PhysicalConstant-dbpediaMatch,
qudt:PhysicalConstant-eclassCode,
qudt:PhysicalConstant-exactConstant,
qudt:PhysicalConstant-hasDimensionVector,
qudt:PhysicalConstant-iec61360Code,
qudt:PhysicalConstant-isoNormativeReference,
qudt:PhysicalConstant-latexDefinition,
qudt:PhysicalConstant-latexSymbol,
qudt:PhysicalConstant-mathMLdefinition,
qudt:PhysicalConstant-normativeReference,
qudt:PhysicalConstant-siExactMatch,
qudt:PhysicalConstant-symbol,
qudt:PhysicalConstant-ucumCode .