power level

https://doi.org/10.1351/goldbook.P04793
Logarithm of the ratio of a
power
to a reference
power
. Levels are expressed in different ways: LP=12 ln(PP0) Np, where Np is the symbol for the unit
neper
coherent with the SI, or LP=10 log10(PP0) dB, where dB is the symbol for the unit
decibel
.
Source:
Green Book, 2nd ed., p. 79 [Terms] [Book]