1.The unit of sound is bel 2.watts is the loudness/power.
3.Often mentioned as decibel ( 1/10 th of bel) depending on which quality of sound you are measuring
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Decibels (dB)
Hertz.
Sound waves are basically mechanical waves. i.e they require a medium to pass.The Unit of measurement for Sound is actually dependent upon what physical feature of sound do you wish to measure. The most commonly used units used are dB (decibel) and Hz (hertz).
There are two: the bel, or more commonly, the decibel, which is a logrithmic representation of the pressure of a sound, and the phon, which is a measure of how loud a sound is perceived.
Decibels are the scale used for measuring the volume of sounds.