Property talk:P9440

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pH value
acidity and alkalinity of an aqueous solution

Represents	pH (Q40936)
Data type	Quantity
Allowed values	0 ≤ 𝓧 ≤ 14
Allowed units	not applicable
Example	distilled water (Q274959) → 7 Camembert (Q131480) → 7.44 Bosten Lake (Q611206) → 8.47
Tracking: usage	Category:Pages using Wikidata property P9440 (Q116223663)
See also	pKa (P1117), temperature (P2076), salinity (P4350), serving temperature (P7767)
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 statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Minimum and maximum Items with highest numeric value Items with lowest numeric value Database reports/Constraint violations/P9440 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 110 Main statement 101 91.8% of uses Qualifier 9 8.2% of uses

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Units: “novalue”: value unit must be one of listed. (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/P9440#Units

Range from “0” to “14”: values should be in the range from “0” to “14”. (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/P9440#Range

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/P9440#citation needed

Scope is as main value (Q54828448), as qualifier (Q54828449): 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/P9440#Scope, 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/P9440#Entity types

This property is being used by: eo:Ŝablono:Informkesto geografiaĵo/dokumentado Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)