sound pressure level

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sound pressure level [′sau̇nd ¦presh·ər ‚lev·əl]

(acoustics)

A value in decibels equal to 20 times the logarithm to the base 10 of the ratio of the pressure of the sound under consideration to a reference pressure; reference pressures in common use are 0.0002 microbar and 1 microbar. Abbreviated SPL.

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