Changes

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.

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]]