Well, to measure absolute pressure, you must know the speed, distance, and volume in terms of time. I use v/d +3vt=11/78s+ the atmospheric pressure
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The difference in pressure between absolute and gauge pressure.
Absolute value is a measure of distance.
You measure the sound pressure with a sound pressure level meter (SPL meter).
55 psig +15=70
It is a measure of the spread or dispersion of the data.