Pressure Measurement. PressurePressure = Force/Area Units of force per unit areaPressure measurements.All pressure measurements are relative measurements.The measurement of a pressure at a point is relative to, or referred to, a reference pressure.. Pressure References. Absolute Pressure:Measured relative to a zero pressure or a perfect vacuum.Gauge Pressure:Measured relative to the local ambient pressure.Differential Pressure:Measured pressure between two point. .
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