Neper (Np) 1
Neper (Np) 1 :
A unit expressing the ratio of two numbers as a natural logarithm; the ratio r corresponds to (1/2) ln r nepers. Quantities differ by 1 neper if one is e2 = 7.389056 times the other. One neper is equal to about 8.685 890 decibels, and in general n nepers equal 20n/(ln 10) decibels. The neper is accepted for use with SI units, and it may become an SI unit in the future. The unit recognizes the Scottish mathematician John Napier (1550-1617), the inventor of the logarithm (Napier often spelled his name Jhone Neper, and he used the Latin form Ioanne Napero in his writings).
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