SOUND PRESSURE LEVEL
Definition
A <SOUND PRESSURE LEVEL> is a <RATIO> of the absolute <SOUND PRESSURE> and a reference level (usually the Threshold of Hearing, or the lowest intensity sound that can be heard by most people). It is calculated as: L_p = 10 lg(p^2/P_0^2)dB where p is <SOUND PRESSURE> and the reference value in airborne acoustics is p_0 = 20 muPa