phon

詳細解釋：

phon

n.（名詞）
A unit of apparent loudness, equal in number to the intensity in decibels of a ,000-hertz tone judged to be as loud as the sound being measured.
方（響度級的單位）：一種表現聲音的單位，在數量的上等於把000赫茲聲音作測星音時的分貝強度

來源：
German
德文
from Greek phônô [sound] * see phone
源自 希臘語 phônô [聲音] *參見 phone