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The pressure of a fluid for all time acts perpendicular to the wall which is in contact
with the fluid.
2. The values of the pressure which acting at any point in a fluid at rest are equal
of its direction. Imagine a minute triangular prism of unit width
in a fluid at rest as shown in Fig. 3.2. Let the pressure acting on the small
surfaces dA,, dA, and dA be p,, p2 and p respectively. The following
equations are obtained from the balance of forces in the horizontal and
vertical directions: The pressure is converted to the force or displacement passing through the
diaphragm, Bourdon tube bellows, etc., and is detected as a change in an
electrical property using a wire strain gauge, a semiconductor strain gauge

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