Difference between revisions of "Sound Pressure Level"
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Sound Pressure Level
</dt>
In decibels, 20 times the logarithm to the base 10 of the ratio of the sound
pressure to the reference pressure. The reference pressure must be
explicitly stated.
</dd>
The following reference pressures are in common use: (a) 2 X 10E-4
microbar, (b) 1 microbar. Reference pressure (a) is in general use for
measurements concerned with hearing and with sound in air and liquids, whereas
(b) has gained widespread acceptance for calibration of transducers and
various kinds of sound measurements in liquids. Unless otherwise explicitly
stated, it is to be understood that the sound pressure is the effective
(root-mean-square) sound pressure. It is to be noted that in many sound fields
the sound pressure ratios are not the square roots of the corresponding power
ratios.
</dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
