Property talk:P1247

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compression ratio
compression ratio of a reciprocating combustion engine; for data compression, use P1107 with qualifiers

Description	compression ratio (Q828137) : compression ratio of the engine
Represents	compression ratio (Q828137)
Data type	Quantity
Template parameter	w:en:Template:pistonspecs : compression
Domain	According to this template: type of reciprocating engine (Q630010) According to statements in the property: reciprocating engine (Q630010) When possible, data should only be stored as statements
Allowed values	According to this template: positive According to statements in the property: 1.0001 ≤ 𝓧 ≤ 40 When possible, data should only be stored as statements
Allowed units	not applicable
Example	Gnome-Rhône Mistral Major (Q902691) → 5.5 Wärtsilä-Sulzer RTA96-C (Q1625442) → unknown
Tracking: usage	Category:Pages using Wikidata property P1247 (Q28648953)
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/P1247 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 186 Main statement 184 98.9% of uses Qualifier 2 1.1% of uses

[create Create a translatable help page (preferably in English) for this property to be included here]

Type “reciprocating engine (Q630010)”: item must contain property “subclass of (P279)” with classes “reciprocating engine (Q630010)” 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/P1247#Type Q630010, SPARQL

Range from “1.0001” to “40”: values should be in the range from “1.0001” to “40”. (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/P1247#Range

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/P1247#Units

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/P1247#Scope, hourly updated report, SPARQL

Allowed entity types are Wikibase item (Q29934200), Wikibase MediaInfo (Q59712033): 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/P1247#Entity types