Dictionary  dec•i•belPronunciation: (des'u-bel", -bul), [key] —n. Physics. 1. a unit used to express the intensity of a sound wave, equal to 20 times the common logarithm of the ratio of the pressure produced by the sound wave to a reference pressure, usually 0.0002 microbar. 2. a unit of power ratio, the number of units being equal to a constant times the logarithm to the base 10 of the intensities of two sources. 3. a unit used to compare two voltages or currents, equal to 20 times the common logarithm of the ratio of the voltages or currents measured across equal resistances. Abbr.: dB, db Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
|
Atlas
Encyclopedia
Dictionary
Thesaurus
Day in History
