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
0112/2///62720#UAA409
Annotations
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 $$\approx\,0.115129\,neper$$.
Decibel(en)

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