A decibel is a unit of measuring the intensity of a sound. It is a logarithmic unit of measurement, meaning that it is based off of a reference point and the unit are ratios of that point. For the decibel, a sound that is near silence is 0dB. Something 10 times as loud as that is 1 dB. 100 times as loud is 20 dB and 1000 times as loud is 30 dB. Normal conversation, for example, is 60 dB, which would correspond to 10,000,00 times louder than a sound very near to silence.
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