Property talk:P2797
Latest comment: 2 years ago by Valverde667 in topic Reference value of 1 pW
Documentation
sound power level
level of sound power at a reference value of 1 pW
level of sound power at a reference value of 1 pW
| Represents | sound power level (Q2157873) | |||||||||
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| Data type | Quantity | |||||||||
| Domain | Anything that creates sound (note: this should be moved to the property statements) | |||||||||
| Allowed values | 1E−5 ≤ 𝓧 ≤ 1,000,000,000 | |||||||||
| Allowed units | decibel (Q5329) | |||||||||
| Example | Black and Decker DS321 (Q23775160) → 97 decibel | |||||||||
| Lists |
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| Proposal discussion | Proposal discussion | |||||||||
| Current uses |
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[create Create a translatable help page (preferably in English) for this property to be included here]
Units: “decibel (Q5329)”: 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/P2797#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/P2797#Scope, hourly updated report, SPARQL
Range from “1e-05” to “1000000000”: values should be in the range from “1e-05” to “1000000000”. (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/P2797#Range
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This property is being used by: Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.) |
Units
editSound Power (Pac) is measured in watt (Q25236), Sound Power Level (Lw) in decibel relative to 1 picowatt (Q23977060).--Kopiersperre (talk) 20:10, 2 May 2016 (UTC)
Related proposal
edit- Please see Wikidata:Property proposal/sound pressure.
--- Jura 16:41, 27 August 2016 (UTC)
Reference value of 1 pW
editISO 80000-1:2009 Quantities and units—Part 1: General (Q26711930) recommends in section 7.2.1 that "Any attachment to a unit symbol as a means of giving information about the special nature of the quantity or context of measurement under consideration is not permitted.". This means that a unit like "decibel relative to 1 pW" is not recommended. Instead, the "context" should be included in the property description or elsewhere. Toni 001 (talk) 09:10, 11 March 2020 (UTC)
- Hello @Lymantria: About my "decommissioning" of item Q23977060, above is the explanation why I think this is the right course of action. Toni 001 (talk) 09:06, 12 March 2020 (UTC)
- It would still be an "informal" unit and is used as such. Lymantria (talk) 14:10, 12 March 2020 (UTC)
- @Lymantria: I propose to make this standard conform. Assume that every property which warrants some qualifier (reference value, substance, temperature, ...) were to follow the current model used by this property, then we would have a proliferation of units like "cubic metres of water", "cubic metres of sulfur", "cubic metre of water at 300K", ... The recommended way of stating such qualifiers is in the property, like this: "water volume: 5 cubic metres", "sulfur volume: 2 cubic metres", "water volume at 300K: 1 cubic metre". In that way, we'll be able to reuse the same unit in different contexts (as opposed to creating a new one - with all of its associated properties like conversion factors, ... - for each context). For this property, we would have (schematically): "sound pressure level (reference value 1 pW): 7 dB". Toni 001 (talk) 07:28, 13 March 2020 (UTC)
- But note that references use this unit. Therefore the item is IMHO notable. Lymantria (talk) 07:49, 13 March 2020 (UTC)
- @Lymantria: The change I propose is not about notability, but rather about moving the reference value from the unit into the property definition (in this case, into the description). This would also be consistent with current use of the property, whose constraints allow exactly one unit and reference value. Toni 001 (talk) 08:24, 14 March 2020 (UTC)
Notified participants of WikiProject Physics
- But note that references use this unit. Therefore the item is IMHO notable. Lymantria (talk) 07:49, 13 March 2020 (UTC)
- @Lymantria: I propose to make this standard conform. Assume that every property which warrants some qualifier (reference value, substance, temperature, ...) were to follow the current model used by this property, then we would have a proliferation of units like "cubic metres of water", "cubic metres of sulfur", "cubic metre of water at 300K", ... The recommended way of stating such qualifiers is in the property, like this: "water volume: 5 cubic metres", "sulfur volume: 2 cubic metres", "water volume at 300K: 1 cubic metre". In that way, we'll be able to reuse the same unit in different contexts (as opposed to creating a new one - with all of its associated properties like conversion factors, ... - for each context). For this property, we would have (schematically): "sound pressure level (reference value 1 pW): 7 dB". Toni 001 (talk) 07:28, 13 March 2020 (UTC)
- It would still be an "informal" unit and is used as such. Lymantria (talk) 14:10, 12 March 2020 (UTC)
- I doubt Wikidata fully conforms to ISO 80000 in many respects. Maybe it should - I think that would take an RFC though. In the meantime, the situation here before Toni's edits seemed fine to me, everything appeared clear and self-evident, and I don't see the changes as a real improvement (though I don't think they're harmful per se either). ArthurPSmith (talk) 13:10, 13 March 2020 (UTC)
