A unit expressing the ratio of two numbers as a natural logarithm.
Where: ln is the natural logarithm
Quantities differ by 1 neper if one is e2 = 7.389056 times the other.
One neper is equal to about 8.685890 decibels, and in general n nepers equal 20n/(ln 10) decibels.
Subjects: Noise & Vibration