Decibel

A decibel is a measurement of the loudness of sound.

The acceptable level of noise on Deep Space 9 was seventy decibels; anyone who was louder than that could be charged with disturbing the peace. 

According to Quark, the usual sound level at Quark's was sixty-five decibels, and with Klingons present up to eighty-five decibels. When the soldiers of a Klingon task force visited Quark's in 2372, the unusual quietness of less than thirty decibels worried Quark. Later, when the Klingons had left, the noise level was back up to seventy-two decibels again, which greatly pleased Quark. 

In order to get two meters of electro-plasma conduit from the USS Defiant (2370) in 2373, Nog listened to Worf's Klingon operas at eighty-two decibels to filter out subharmonic distortions. 

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Dezibel