Question

difference between loudness and intensity

Answer 1

loudness is a subjective quantity.
whereas
intensity is a objective quantity.

loudness is measured in decibel
whereas
intensity is measured in watts per sq. metre

loudness directly depends on the intensity of sound
whereas
intensity does not depend on loudness

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Answer 2

Intensity of a sound wave is defined as the amount of sound energy passing through a unit area per second. Loudness is a measure of the response of the ear to the sound. The loudness of a sound is defined by its amplitude. The amplitude of a sound decides its intensity, which in turn is perceived by the ear as loudness.