The decibel (dB) is used to measure sound level. It is a logarithmic unit of measurement that expresses the intensity of sound relative to a specified or implied reference level.
The decibel is also used for a wide variety of other measurements in science and engineering. It is a logarithmic unit used to describe a ratio. It confers a number of advantages, such as the ability to conveniently represent very large or small numbers, a logarithmic scaling that roughly corresponds to the human perception of sound and light, and the ability to carry out multiplication of ratios by simple addition and subtraction.
== Units and Measures ==
The decibel is a dimensionless unit as it expresses a ratio of two quantities with the same unit. For example, two loudspeakers with different power, the first playing a sound with power P1, and another playing a louder version of the same sound with power P2. If everything else kept the same, the difference in decibels between the two speakers will be: 10 log (P2/P1) dB (where the log is to base 10)
== References ==
http://www.phys.unsw.edu.au/jw/dB.html http://www.rane.com/par-s.html#SPL http://www.answers.com/topic/sound
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