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There are two: the bel, or more commonly, the decibel, which is a logrithmic representation of the pressure of a sound, and the phon, which is a measure of how loud a sound is perceived.
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The decibel scale is a logarithmic scale. Scroll down to related links and look at "Decibel - Wikipedia" and "Sound level meter - Wikipedia".
60% of 188= 60% * 188= 0.6 * 188= 112.8
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