As nouns the difference between bels and phon
is that bels is plural of bel while phon is a unit of apparent loudness, equal in number to the intensity in decibels of a 1,000-hertz tone judged to be as loud as the sound being measured.
bels
English
Noun
(head)
Anagrams
*
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phon
English
Noun
(phons)
(acoustics) A unit of apparent loudness, equal in number to the intensity in decibels of a 1,000-hertz tone judged to be as loud as the sound being measured.