|
One of the direct applications of the equation of Fluid Statics we
have derived is in the devices used to measure pressure. Now it is
necessary to recall that we have an Absolute Pressure and a
Gauge Pressure. We note that pressure is always measured as
a difference or with respect to a datum or reference. Absolute
pressure is measured relative to a perfect vacuum, whereas gauge
pressure is measured relative to atmospheric pressure. Further,
Absolute pressure is the sum of atmospheric pressure and the gauge
pressure. See Fig. 2.8 below.
| Figure 2.8 : Definition of
gauge and absolute pressures |
(c) Aerospace, Mechanical & Mechatronic Engg. 2005
University of Sydney
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