Distinguish Between Loudness and Intensity of Sound

Intensity of Sound:

Intensity of a sound wave is defined as the amount of sound energy passing through a unit area per second.

Intensity of sound is given as:



  • I is the sound intensity
  • P is the acoustic power
  • A is the normal area to the direction of propagation


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.

Therefore, following is the table which explains the difference between loudness and intensity:

Loudness is the measure of response of the ear to the sound. Intensity is the sound power per unit area.
Loudness is measured in decibels. Intensity is measured in Watt per meter square.
Loudness is dependent on the sensitivity of the human ears. Intensity is independent of the sensitivity of the human ears.
Loudness is a subjective quantity. Intensity is an objective quantity.

Check the video below and learn about the Characteristics Of Sound Waves:


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