Difference between revisions of "Decibel"
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| − | The '''decibel''' is the unit of sound [[pressure]] used to measure [[noise]]. Decibel means 1/10 of a Bel, after [[Alexander Graham Bell]]. Because decibels are such a small measure, they are computed [[logarithm]]ically and cannot be added arithmetically. An increase of ten dB is perceived by human [[ear]]s as a doubling of noise. There is no absolute decibel scale, so the decibel is used to measure sound in comparison to another sound | + | The '''decibel''' is the unit of sound [[pressure]] used to measure [[noise]]. Decibel means 1/10 of a Bel, after [[Alexander Graham Bell]]. Because decibels are such a small measure, they are computed [[logarithm]]ically and cannot be added arithmetically. An increase of ten dB is perceived by human [[ear]]s as a doubling of noise. There is no absolute decibel scale, so the decibel is used to measure sound in comparison to another sound. |
[[category:Units of Measurement]][[category:physics]] | [[category:Units of Measurement]][[category:physics]] | ||
Revision as of 16:30, April 26, 2011
The decibel is the unit of sound pressure used to measure noise. Decibel means 1/10 of a Bel, after Alexander Graham Bell. Because decibels are such a small measure, they are computed logarithmically and cannot be added arithmetically. An increase of ten dB is perceived by human ears as a doubling of noise. There is no absolute decibel scale, so the decibel is used to measure sound in comparison to another sound.