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 $1 b e l$ (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) $0 d e c i b e l$ is equal to $1 p i c o W a t t s p e r M e t r e S q u a r e d$ . 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 $20 m i c r o p a s c a l s R M S$ , and for sound power $0 d e c i b e l s$ sometimes equals $1 p i c o W a t t$ . In all cases, one decibel equals $\approx 0.115129 n e p e r$ .

Properties

qudt:applicableSystem

qudt:dbpediaMatch

qudt:hasDimensionVector

qudt:hasQuantityKind

qudt:iec61360Code

qudt:prefix

qudt:scalingOf

qudt:symbol

rdf:type

qudt:ucumCode

qudt:uneceCommonCode

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 b e l

(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 d e c i b e l

is equal to

1 p i c o W a t t s p e r M e t r e S q u a r e d

. 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 m i c r o p a s c a l s R M S

, and for sound power

0 d e c i b e l s

sometimes equals

1 p i c o W a t t

. In all cases, one decibel equals

\approx 0.115129 n e p e r

qudt:informativeReference

rdfs:isDefinedBy

rdfs:label

View as: CSV

Work in progress

RDF/XML

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TURTLE

@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<http://qudt.org/vocab/unit/DeciB>
  rdf:type <http://qudt.org/schema/qudt/DimensionlessUnit> ;
  rdf:type <http://qudt.org/schema/qudt/LogarithmicUnit> ;
  rdf:type <http://qudt.org/schema/qudt/Unit> ;
  <http://purl.org/dc/terms/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 $\\approx\\,0.115129\\,neper$."^^<http://qudt.org/schema/qudt/LatexString> ;
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  <http://qudt.org/schema/qudt/applicableSystem> <http://qudt.org/vocab/sou/CGS-ESU> ;
  <http://qudt.org/schema/qudt/applicableSystem> <http://qudt.org/vocab/sou/CGS-GAUSS> ;
  <http://qudt.org/schema/qudt/applicableSystem> <http://qudt.org/vocab/sou/IMPERIAL> ;
  <http://qudt.org/schema/qudt/applicableSystem> <http://qudt.org/vocab/sou/PLANCK> ;
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  <http://qudt.org/schema/qudt/dbpediaMatch> "http://dbpedia.org/resource/Decibel"^^xsd:anyURI ;
  <http://qudt.org/schema/qudt/hasDimensionVector> <http://qudt.org/vocab/dimensionvector/A0E0L0I0M0H0T0D1> ;
  <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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  <http://qudt.org/schema/qudt/uneceCommonCode> "2N" ;
  rdfs:isDefinedBy <http://qudt.org/3.1.0/vocab/unit> ;
  rdfs:label "Decibel"@en ;
.

JSON

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    ,"applicable system":"sou:CGS" 
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    ,"applicable system":"sou:CGS-ESU" 
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    ,"applicable system":"sou:IMPERIAL" 
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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" 
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    ,"isDefinedBy":"&lt;http:\/\/qudt.org\/3.1.0\/vocab\/unit&gt;" 
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    ,"type":"qudt:DimensionlessUnit" 
    ,"type":"qudt:LogarithmicUnit" 
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    ,"unece common code":"2N" 
    ]}

JSON-LD

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