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en.wikipedia.org/wiki/Pressure_measurement

Pressure measurement is the analysis of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum.Instruments used to measure and display pressure in an integral unit are called pressure gauges or vacuum gauges.

Technical note 12, Differential pressure mass flow meter, rev. b, www.arian.cl 1 Theory overview of flow measurement using differential pressure devices based on ISO-5167 standard.

www.alicat.com/knowledge-base/theory-of-operation-laminar...

Understanding differential pressure-based laminar flow measurement Alicat mass flow instruments operate on the principle of differential pressure-based laminar flow measurement. Our flow meter and flow controllers are multi-parameter (multivariate) instruments that also display the pressure and temperature data that we use to determine both ...

itstillruns.com/definition-differential-pressure-5779450.html

Differential pressure can be measured as absolute pressure or gauge pressure. It is important to know the difference between the two when using the information in measurements or calculations. Absolute pressure is the sum of atmospheric pressure and the gauge pressure measured. Gauge pressure is the measurement read from the gauge.

www.coulton.com/beginners_guide_to_differential_pressure...

The differential pressure measurement is not concerned whether the lower of the two pressures is at a vacuum, atmospheric or some other pressure. It is only interested in the difference between the two. Asshown in Fig4 . The fundamental of differential pressure measurement is established.

visaya.solutions/.../differential-pressure-flow-measurement

Flow measurement with a differential pressure transmitter. Basically, a differential pressure (DP) flow meter combines three essential elements. The first, the primary (kinda obvious) element, creates a change in pressure. The second, the transmitter, reads the pressure change and converts it to numbers we can read.

www.automationwiki.com/.../Differential_Pressure_Level_Measurement

Differential pressure level sensors are particularly useful for preventing the problem of GIGO i.e. Garbage In, Garbage Out, experienced in various level applications. In actuality, differential pressure level measurement technology does not measure level. It just infers level of the process liquid.