Difference between revisions of "Decibel"
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| − | The '''decibel''' is | + | The '''decibel''' ('''dB''') is a logarithmic unit, often used to measure of sound [[pressure]]. Decibel means 1/10 of a Bel, after [[Alexander Graham Bell]]. There is no absolute decibel scale, so the decibel is used to measure sound in comparison to another sound, i.e, the 0 dB reference. This is defined as a sound pressure level of .0002 microbar, or 20 micropascals: commonly the threshold of hearing a sound with a frequency of 1 KHz. |
[[category:Units of Measurement]][[category:physics]] | [[category:Units of Measurement]][[category:physics]] | ||
| + | [[Category:Articles needing major improvement]] | ||
Revision as of 13:13, February 1, 2012
The decibel (dB) is a logarithmic unit, often used to measure of sound pressure. Decibel means 1/10 of a Bel, after Alexander Graham Bell. There is no absolute decibel scale, so the decibel is used to measure sound in comparison to another sound, i.e, the 0 dB reference. This is defined as a sound pressure level of .0002 microbar, or 20 micropascals: commonly the threshold of hearing a sound with a frequency of 1 KHz.