Sone

Rarity: Common

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What Wikipedia says

The sone () is a unit of loudness, the subjective perception of sound pressure. The study of perceived loudness is included in the topic of psychoacoustics and employs methods of psychophysics. Doubling the perceived loudness doubles the sone value. Proposed by Stanley Smith Stevens in 1936, it is not an SI unit.

Excerpt from the Wikipedia article “Sone”, under the CC BY-SA 4.0 license. Read the article on Wikipedia