The of a sound is related to the amount of energy flowing in the sound waves.

intensity

Explanation:

The intensity of sound is a measure of how much energy is flowing (through a unit area in which is perpendicular to the direction of the sound) per unit time.

Its unit are micro joules per second per square cm. or watt per square cm.

watt is the unit of power and is gotten by the fact that power is the rate of doing work. so, p=E/t . The italicized text above (energy per unit time) can be replaced by power,p.