what is the unit of measuring sound
There are fixed units such as meters and relative units such as decibels (dB). Relative units are related to specific conditions. For example, decibels in water have a different relative value than decibels in air. Scientists have agreed to use 1 microPascal (Î¼Pa) as the reference pressure for underwater sound. In air, however, scientists have agreed to use a higher reference pressure of 20 microPascals.