Sound pressure level
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3-1-065
Sound pressure level (in decibels)
Alternative term: S.P.L. (in decibels)
Twenty times the logarithm to the base 10 of the ratio of the sound pressure to the reference pressure (20 micronewtons per square metre or 2*10-4 microbar or 2*10-4 dyne per square centimetre).
Reference: I.E.C. (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
