Changes

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.

The '''decibel''' ('''dB''') is a logarithmic unit, often used to measure 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]]

[[Category:Articles needing major improvement]]