Page 19 - BASIC CONCEPTUAL OF THERMOFLUID

CHAPTER 2: FLUID APPLICATION

Fig.2: (a) A hydraulic jack operates by applying forces (F1, F2) to an incompressible fluid in a U-tube,
using a movable piston (A1, A2) on each side of the tube. (b) Hydraulic jacks are commonly used by car
mechanics to lift vehicles so that repairs and maintenance can be performed [3].

From Pascal’s principle, it can be shown that the force needed to lift the car is less than the weight of the
car:

1
1 = 2
2

2.3 Application Concept of Manometer, Piezometer and Barometer
2.3.1 Manometer

An instrument for measuring the pressure acting on a column of fluid, especially one with a U-
shaped tube of liquid in which a difference in the pressures acting in the two arms of the tube
causes the liquid to reach different heights in the two arms. Fig. 3 below illustrate how manometer
is working manometers. The other devices that measure pressure is piezometer and barometer [4].

Fig. 3: Simple Manometer [4]

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