Phon vs. Bel — What's the Difference?

The phon is a logarithmic unit of loudness level for tones and complex sounds. Loudness is measured in sone which is a linear unit.

Ten decibels.

A unit of apparent loudness, equal in number to the intensity in decibels of a 1,000-hertz tone perceived to be as loud as the sound being measured.

A measure of relative power, defined as log₁₀(P ₁/P ₂), where P₁ and P₂ are the measured and reference power respectively.

(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.

The Babylonian name of the god known among the Hebrews as Baal. See Baal.

A unit of subjective loudness

A thorny rutaceous tree (Ægle marmelos) of India, and its aromatic, orange-like fruit; - called also Bengal quince, golden apple, wood apple. The fruit is used medicinally, and the rind yields a perfume and a yellow dye.

A unit of sound intensity equal to ten decibels.

A logarithmic unit of sound intensity equal to 10 decibels

Babylonian god of the earth; one of the supreme triad including Anu and Ea; earlier identified with En-lil