unit:DeciB

URI: http://qudt.org/vocab/unit/DeciB

Type
Description

A customary logarithmic measure most commonly used (in various ways) for measuring sound.Sound is measured on a logarithmic scale. Informally, if one sound is $1\,bel$ (10 decibels) "louder" than another, this means the louder sound is 10 times louder than the fainter one. A difference of 20 decibels corresponds to an increase of 10 x 10 or 100 times in intensity. The beginning of the scale, 0 decibels, can be set in different ways, depending on exactly the aspect of sound being measured. For sound intensity (the power of the sound waves per unit of area) $0\,decibel$ is equal to $1\,picoWatts\,per\,Metre\,Squared$. This corresponds approximately to the faintest sound that can be detected by a person who has good hearing. For sound pressure (the pressure exerted by the sound waves) 0 decibels equals $20\,micropascals\,RMS$, and for sound power $0\,decibels$ sometimes equals $1\,picoWatt$. In all cases, one decibel equals $\approx\,0.115129\,neper$.

Properties
qudt:applicableSystem
qudt:dbpediaMatch
http://dbpedia.org/resource/Decibel
qudt:hasDimensionVector
qudt:hasQuantityKind
qudt:iec61360Code
0112/2///62720#UAA409
qudt:symbol
dB
rdf:type
qudt:ucumCode
dB
qudt:uneceCommonCode
2N
Annotations
dcterms:description
A customary logarithmic measure most commonly used (in various ways) for measuring sound.Sound is measured on a logarithmic scale. Informally, if one sound is $1\,bel$ (10 decibels) "louder" than another, this means the louder sound is 10 times louder than the fainter one. A difference of 20 decibels corresponds to an increase of 10 x 10 or 100 times in intensity. The beginning of the scale, 0 decibels, can be set in different ways, depending on exactly the aspect of sound being measured. For sound intensity (the power of the sound waves per unit of area) $0\,decibel$ is equal to $1\,picoWatts\,per\,Metre\,Squared$. This corresponds approximately to the faintest sound that can be detected by a person who has good hearing. For sound pressure (the pressure exerted by the sound waves) 0 decibels equals $20\,micropascals\,RMS$, and for sound power $0\,decibels$ sometimes equals $1\,picoWatt$. In all cases, one decibel equals $\approx\,0.115129\,neper$.
qudt:informativeReference
http://en.wikipedia.org/wiki/Decibel?oldid=495380648
https://cdd.iec.ch/cdd/iec62720/iec62720.nsf/Units/0112-2---62720%23UAA409
rdfs:isDefinedBy
rdfs:label
Decibel(en)
View as:  CSV

Work in progress

RDF/XML 
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    <j.0:symbol>dB</j.0:symbol>
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TURTLE 
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@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<http://qudt.org/vocab/unit/DeciB>
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  rdf:type <http://qudt.org/schema/qudt/LogarithmicUnit> ;
  rdf:type <http://qudt.org/schema/qudt/Unit> ;
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  <http://qudt.org/schema/qudt/applicableSystem> <http://qudt.org/vocab/sou/CGS-GAUSS> ;
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  <http://qudt.org/schema/qudt/applicableSystem> <http://qudt.org/vocab/sou/PLANCK> ;
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  <http://qudt.org/schema/qudt/hasQuantityKind> <http://qudt.org/vocab/quantitykind/SoundExposureLevel> ;
  <http://qudt.org/schema/qudt/hasQuantityKind> <http://qudt.org/vocab/quantitykind/SoundPowerLevel> ;
  <http://qudt.org/schema/qudt/hasQuantityKind> <http://qudt.org/vocab/quantitykind/SoundPressureLevel> ;
  <http://qudt.org/schema/qudt/hasQuantityKind> <http://qudt.org/vocab/quantitykind/SoundReductionIndex> ;
  <http://qudt.org/schema/qudt/iec61360Code> "0112/2///62720#UAA409" ;
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  rdfs:isDefinedBy <http://qudt.org/3.0.0/vocab/unit> ;
  rdfs:label "Decibel"@en ;
.
JSON 
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    ,"applicable system":"sou:CGS-GAUSS" 
    ,"applicable system":"sou:IMPERIAL" 
    ,"applicable system":"sou:PLANCK" 
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    ,"description":"A customary logarithmic measure most commonly used (in various ways) for measuring sound.Sound is measured on a logarithmic scale. Informally, if one sound is $1\\,bel$ (10 decibels) \"louder\" than another, this means the louder sound is 10 times louder than the fainter one. A difference of 20 decibels corresponds to an increase of 10 x 10 or 100 times in intensity. The beginning of the scale, 0 decibels, can be set in different ways, depending on exactly the aspect of sound being measured. For sound intensity (the power of the sound waves per unit of area) $0\\,decibel$ is equal to $1\\,picoWatts\\,per\\,Metre\\,Squared$. This corresponds approximately to the faintest sound that can be detected by a person who has good hearing. For sound pressure (the pressure exerted by the sound waves) 0 decibels equals $20\\,micropascals\\,RMS$, and for sound power $0\\,decibels$ sometimes equals $1\\,picoWatt$. In all cases, one decibel equals $\\approx\\,0.115129\\,neper$." 
    ,"has dimension vector":"dimension:A0E0L0I0M0H0T0D1" 
    ,"has quantity kind":"quantitykind:SoundExposureLevel" 
    ,"has quantity kind":"quantitykind:SoundPowerLevel" 
    ,"has quantity kind":"quantitykind:SoundPressureLevel" 
    ,"has quantity kind":"quantitykind:SoundReductionIndex" 
    ,"iec-61360 code":"0112\/2\/\/\/62720#UAA409" 
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    ,"isDefinedBy":"&lt;http:\/\/qudt.org\/3.0.0\/vocab\/unit&gt;" 
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    ,"symbol":"dB" 
    ,"type":"qudt:DimensionlessUnit" 
    ,"type":"qudt:LogarithmicUnit" 
    ,"type":"qudt:Unit" 
    ,"ucum code":"dB" 
    ,"unece common code":"2N" 
    ]}
JSON-LD 
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