Property talk:P873

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phase point
phase point to describe critical point and triple point (see talk page for an example)

Description	phase point to describe critical point and triple point, use of qualifier to describe the pressure, the temperature and the matter phase characterizing the point
Represents	phase (Q104837)
Data type	Item
Domain	According to this template: term According to statements in the property: type of chemical entity (Q113145171) When possible, data should only be stored as statements
Allowed values	According to this template: critical point (Q111059),triple point (Q106410) According to statements in the property: triple point (Q106410) or critical point (Q111059) When possible, data should only be stored as statements
Usage notes	jako wartość należy podać punkt potrójny (Q106410) lub punkt krytyczny (Q111059) oraz temperaturę (P2076) i ciśnienie (P2077) jako kwalifikatory; podanie gęstości (P2054) albo objętości molowej (P2807) jest opcjonalne
Example	According to this template: see Wikidata:Chemistry_task_force/Properties. According to statements in the property: undecane (Q150731) → critical point (Q111059) butane (Q134192) → triple point (Q106410) When possible, data should only be stored as statements
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 By value of property Most statements Fewest statements Most sitelinks Most linked wikis Total of sitelinks on items Most identifiers Fewest identifiers 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/P873 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 32 Main statement 29 90.6% of uses Qualifier 3 9.4% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

One of triple point (Q106410), critical point (Q111059): value must be one of the specified items. Please expand list if needed. (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/P873#One of, values statistics, search, SPARQL

Type “type of chemical entity (Q113145171)”: item must contain property “instance of (P31)” with classes “type of chemical entity (Q113145171)” 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/P873#Type Q113145171, SPARQL

Required qualifier “temperature (P2076)”: this property should be used with the listed qualifier. (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/P873#mandatory qualifier, SPARQL

Required qualifier “under pressure (P2077)”: this property should be used with the listed qualifier. (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/P873#mandatory qualifier, SPARQL

Qualifiers “density (P2054), molar volume (P2807), phase of matter (P515), temperature (P2076), under pressure (P2077), statement is subject of (P805), uncertainty corresponds to (P2571), reason for deprecated rank (P2241), reason for preferred rank (P7452), criterion used (P1013)”: this property should be used only with the listed qualifiers. (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/P873#allowed qualifiers, SPARQL

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

List of violations of this constraint: Database reports/Constraint violations/P873#Scope, hourly updated report, SPARQL

Citation needed: the property must have at least one reference (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/P873#citation needed

This property is being used by: hy:Կաղապար:Տեղեկաքարտ Սեղանի խաղ Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Example of use

For the triple point

ethanol (Q153):

phase point (item):triple point (Q106410)

temperature (P2076) (number): XXX K

under pressure (P2077) (number): XXX Pa

phase of matter (P515) (item):solid

phase of matter (P515) (item):vapor

phase of matter (P515) (item):liquid

In case of triple point between different solid phases, an item has to be created for each solid phase and then the point has to be defined as below:

water (Q283):

phase point (item):triple point (Q106410)

temperature (P2076) (number): XXX K

under pressure (P2077) (number): XXX Pa

phase of matter (P515) (item):Ice I

phase of matter (P515) (item):Ice II

phase of matter (P515) (item):Ice III

For the critical point:

water (Q283):

phase point (item):critical point (Q111059)

temperature (P2076) (number): XXX K

under pressure (P2077) (number): XXX Pa

Snipre (talk) 12:13, 11 September 2013 (UTC)

How to use this property?

@Snipre: This property exists since 600 days and it is still only used on water (Q283). Moreover, it looks to me that in this example it's even wrongly used. Can you please add a few more examples or update the documentation for clarification? --Pasleim (talk) 10:31, 5 May 2015 (UTC)

@Pasleim: Done. Snipre (talk) 16:59, 5 October 2015 (UTC)