Sound Pressure Level (SPL)
a unit that is 20 times the logarithm to the base 10 of the ratio of the pressure of the measured sound to the reference pressure of 20 micronewtons per square meter.
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a unit that is 20 times the logarithm to the base 10 of the ratio of the pressure of the measured sound to the reference pressure of 20 micronewtons per square meter.