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How loud is forty two decibels?

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Depends on who is doing the hearing (human or animal) and if the frequency is propagated through air, water or solid. 42 dB is considered whisper level in speech.

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42 decibels is about as loud as a library or bird calls. For comparison, a vacuum cleaner is about 70 decibels. It is important to remember that sounds scales logarithmically, so 40 decibels is only 1 8th the volume of 70 decibels.

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