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.

See also: Logarithm, Napier, John.

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Subjects: Noise & Vibration