The pressure on a fluid is measured in two systems

(1)    Absolute pressure
(2)    Gauge pressure

Absolute Pressure:

The pressure, which is measured with reference to absolute vacuum pressure or zero pressure, is called as Absolute pressure.

Gauge Pressure:

The pressure, which is measured above the atmospheric pressure, is called as gauge pressure. It is measured with the help of pressure measuring instruments.

Vacuum Pressure:

•    The pressure, which is measured below the atmospheric pressure, is called as vacuum pressure or negative gauge pressure.

•    It is measured with the help of pressure measuring instruments.

•    The relationship between the absolute pressure, gauge pressure and vacuum pressure.

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