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power level

Logarithm of the ratio of a power to a reference power. Levels are expressed in different ways: L P = 1 2 ln ( P P 0 ) Np, where Np is the symbol for the unit neper coherent with the SI, or L P = 10 log 10 ( P P 0 ) dB, where dB is the symbol for the unit decibel .
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.P04793.
Original PDF version: http://www.iupac.org/goldbook/P04793.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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