An
absolute pressure measurement measures the difference from the ideal or
absolute vacuum. This is why this measurement is independent of environmental influences such as weather or altitude.
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For example, if your tire gauge reads 34 psi (pounds per square inch), then the absolute pressure is 34 psi plus 14.7 psi (Patm in psi), or 48.7 psi (equivalent to 336 kPa). Absolute pressure is the sum of gauge pressure and atmospheric pressure.Oct 25, 2020
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Using an absolute pressure sensor eliminates the reference to a varying atmospheric pressure and relying on a specific pressure range for reference. Differential Pressure can be a little more complex than gauge or absolute, but is simply measuring the difference between two medias.