What the difference between loudness and intensity

Sound intensity is the ratio of power to surface area. Loudness is our subjective perception of sound intensity.

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Loudness is related to the amplitude of sound waves or pressure amplitude displacement relative to atmospheric pressure, typically, whereas intensity is the rate at which power rate of energy transfer, or work per unit time is transferred across a given area Power/Area, or rate of energy transfer per unit area.

Explanation:

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