The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. The decibel is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory.
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