Inverse Square Law: In mathematics, the law that states that in the absence of reflective surfaces, sound pressure (or light) falls off at a rate inverse to the square of the distance from its source. In other words, every time the distance from the sound source is doubled, the sound pressure level is reduced by a factor of 4, or 12 db.

 

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Inverse Square Law: In mathematics, the law that states that in the absence of reflective surfaces, sound pressure (or light) falls off at a rate inverse to the square of the distance from its source. In other . . . View Full Definition

Pounds Per Square Inch (PSI): A unit for measuring pressure. One PSI equals the pressure resulting from a force of one pound force acting over an area of one square inch.

R Square (R2): Square of the correlation coefficient. The proportion of the variability in one series that can be explained by the variability of one or more other series a regression model. A measure of t . . . View Full Definition

Permanent Law: Legislation that would be in force in the absence of all temporary or short-term laws (e.g., farm bills). The Agricultural Adjustment Act of 1938, the Agricultural Act of 1949, and the Commo . . . View Full Definition