Distinguish between loudness and intensity of sound.
The Intensity of sound is defined as the sound power per unit area in a direction perpendicular to that area. The SI unit of intensity is the watt per square meter .
The loudness of sound refers to how loud or soft a sound seems to a listener and is determined by the intensity or the amount of energy. The unit of intensity is the decibel (dB).
Higher the decibel level sound waves have greater intensity and sounds are louder.