(db) A unit for the measurement of sound, expressed as the logarithmic ratio of two amounts of pressure, power, or intensity between a measured quantity and a reference quantity
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}