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n2http://dbpedia.org/resource/Level_(logarithmic_quantity)
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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).
rdfs:seeAlso
dbpedia:Decibel