Definitions for "SOUND LEVEL"
This is the effect on air molecules by acoustic energy (sound waves). Sound levels are measured in decibels, of which there are numerous forms. It is also affected by factors such as air pressure.
Sound pressure in decibels, usually referenced to the standard level near the hearing threshold at middle frequencies, and almost always weighted according to one of the standard frequency weighting contours, A, B or C. Such sound levels should be described as dB (A), for example. See Frequency Weighting.
A subjective measure of sound expressed in decibels as a comparison corresponding to familiar sounds experienced in a variety of situations.