Sound pressure level

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)

English

South

Luminance

Level (technician training - WWA)

Latitude (in degrees)

charge current

Intensity

Illuminance

Energy

Contrast

Celsius (previously Centigrade)

Capacitance

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM