Property talk:P1295

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emissivity
ability of a substance to radiate thermal energy from its surface

Description	emissivity (Q899670) : ability of a substance to radiate energy
Represents	emissivity (Q899670)
Data type	Quantity
Domain	According to this template: any type of material (Q214609) According to statements in the property: material (Q214609) When possible, data should only be stored as statements
Allowed values	According to this template: 0-1 According to statements in the property: 0 ≤ 𝓧 ≤ 1 When possible, data should only be stored as statements
Allowed units	not applicable
Example	cement (Q45190) → 0.54
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) Minimum and maximum Items with highest numeric value Items with lowest numeric value Database reports/Constraint violations/P1295 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 3 Main statement 2 66.7% of uses Qualifier 1 33.3% of uses

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

Range from “0” to “1”: values should be in the range from “0” to “1”. (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/P1295#Range

Type “material (Q214609)”: item must contain property “subclass of (P279)” with classes “material (Q214609)” 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/P1295#Type Q214609, SPARQL

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/P1295#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/P1295#Scope, hourly updated report, SPARQL