Page 35 - ebook fluid mechanics_finalize

FLUID MECHANICS

According to Pascal's principle (Figure 3.3), the original pressure (P1) exerted on

the small piston (A1) will produce an equal pressure (P2) on the large piston (A2).

However, because A2 has 10 times the area of A1, it will produce a force (F2) that is 10

times greater than the original force (F1). Through Pascal's principle, a relatively small
force exerted on a hydraulic press can be magnified to the point where it will lift a car.

The force, F acting on area, a produced a pressure p1 which is transmitted equally

in all direction through the liquid. If the two pistons are at the same level, the pressure,

p2 acting on the larger piston must equal p1.

p = p ................. 1
1
2
F
P = ................. 2
1
a

W
P = ................. 3
2
A

Figu re 3.4 : Piston at same level

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