ABSTRACT
The Bourdon gauge is useful as a general indicator of pressure but is not suitable where considerable accuracy is demanded, as is generally the case when differential pressures are to be measured.
3.4 Pressure Force on a Submerged Surface 3.4.1 Plane Surface The determination of the magnitude and location o f the resultant pressure force on a plane surface may be explained by reference to Fig. 3.5. The area of the submerged surface is A and it is inclined at angle a
to the horizontal. Clearly, due to the linear increase in pressure intensity with depth, the point of application o f this resultant, known as the centre o f pressure, must be situated below the centroid of area. It is only coincident with it when the surface is horizontal.
