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Additional
level (logarithmic quantity)
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Level (logarithmic quantity)
In the
International System of Quantities
, the
level
of a quantity is the
logarithm
of the ratio of the value of that quantity to a reference value of the same quantity. Examples are
sound power level
(literally, the level of the
sound power
, abbreviated SWL),
sound exposure level
(SEL),
sound pressure level
(SPL) and
particle velocity level
(SVL).
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