3.01 level. In acoustics, logarithm of the ratio of a variable quantity to a corresponding reference value of the same units. The base of the logarithm, the reference value, and the kind of level are to be specified....
3.26 (vibratory) force level. Ten times the logarithm to the base ten of a time-mean-square force to the square of the reference value for (vibratory) force level of 1 micronewton (1 µΝ). Unit, decibel (dB); symbol,...
3.25 sound intensity level. Ten times the logarithm to the base ten of the ratio of the time-average intensity of a given sound in a stated direction to the reference value for sound intensity of 1 picowatt per square meter (1 pW/m2). Unit, decibel (dB);...
3.24 (vibratory) acceleration level. Ten times the logarithm to the base ten of the ratio of a time-mean-square vibratory acceleration to the square of a specified reference value for acceleration. Unit, decibel (dB); symbol, La. Annotation...
3.23 particle velocity level. Ten times the logarithm to the base ten of the ratio of the time-mean-square particle velocity of a given sound or vibration to the square of a specified reference value for particle velocity. Unit, decibel (dB); symbol, Lv....
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