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.
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Decibels are the scale used for measuring the volume of sounds.
the unit is m3 (cubic metre)
Liters & milliliters
m3
Base units need not have ANY volume. A second is the base unit for measuring time and it has no volume!