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Loudness is the characteristic by which we can distinguish between lound and faint sound.
intensity is the amt. of energy passing per unit area per unit time.in short it is measure of loudness
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Loudness : The sensation produced by ear which enables us to distinguish between a faint sound and a loud sound is called loudness. Loudness depends on the sensitivity of ears.
Intensity : The average energy transported by a sound per second per unit area is intensity. It is measured in watts per square meter and it doesn't depend on sensitivity of ears.
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