Property talk:P1645

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NIST/CODATA ID
identifier for a physical constant

Description	Identifier on the NIST website for the CODATA values of physical constants
Associated item	Committee on Data for Science and Technology (Q735279)
Data type	External identifier
Domain	According to this template: physical property (Q4373292) According to statements in the property: physical constant (Q173227) When possible, data should only be stored as statements
Allowed values	According to this template: letters and numbers According to statements in the property: [^\d]+(\d?[a-z]?)+ When possible, data should only be stored as statements
Example	speed of light in vacuum (Q2111) → c Planck constant (Q122894) → h
Source	http://physics.nist.gov/cuu/Constants/index.html
Formatter URL	http://physics.nist.gov/cgi-bin/cuu/Value?$1
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Database reports/Constraint violations/P1645 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 79 Main statement 67 84.8% of uses Qualifier 2 2.5% of uses Reference 10 12.7% of uses
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Distinct values: this property likely contains a value that is different from all other items. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1645#Unique value, SPARQL (every item), SPARQL (by value)

Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1645#Single value, SPARQL

Type “physical constant (Q173227)”: item must contain property “instance of (P31)” with classes “physical constant (Q173227)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1645#Type Q173227, SPARQL

Format “[^\d]+(\d?[a-z]?)+”: value must be formatted using this pattern (PCRE syntax). (Help)

List of violations of this constraint: Database reports/Constraint violations/P1645#Format, hourly updated report, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1645#Entity types

Scope is as main value (Q54828448), as reference (Q54828450): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1645#Scope, SPARQL