Pressure measurement
Pressure measurement refers to the process of determining the physical pressure of fluids and involves using a pressure measuring instrument such as a pressure gauge to determine and display data (also see Metrology).
Fluid columns are used in the most basic form of pressure measurement.
See Fig. 1 Pressure measurement

Fig. 1 Pressure measurement: U-tube pressure gauge
Spring pressure gauges are used for higher pressures. See Fig. 2 Pressure measurement
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Fig. 2 Pressure measurement: Bourdon tube / tubular spring pressure gauge
Pressure gauges are also frequently fitted with sensors, e.g. differential pressure or over-pressure sensors, which use capacitive, inductive, or piezoelectric sensing, or high-resolution sensing for transient pressure fields.