名詞 phon:

1. a unit of subjective loudness

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(jí)的單位）：一種表現(xiàn)聲音的單位，在數(shù)量的上等于把000赫茲聲音作測星音時(shí)的分貝強(qiáng)度

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