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)
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