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Decibel
The Decibel – “dB” or “dB(A)” – is a measure of Sound pressure level and thus of Loudness. The decibel scale from 0 to 120 dB(A) reflects the range from the absolute threshold of hearing to the pain threshold. The scale is not linear. We perceive an increase of ten decibels as roughly a doubling of the loudness – in the lower and at the upper ends of the range.