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# Met 212 _4

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### Met 212 _4

1. 1. MET 212 Fluid Mechanics Lecture # 41/15/2013
2. 2. ObjectivePressure Variation in Fluid at Rest Pressure Measurement Mechanical Pressure Measuring DeviceHydrostatic Force on Plane Surface1/15/2013
3. 3. Pressure Variation in Fluid at Rest p=po h A B γ = specific weightThe pressure is the same at tall points along the line AB even with irregular shape1/15/2013
4. 4. Pressure MeasurementRepresentation of gage and absolute pressure1/15/2013
5. 5. Pressure Measurement Mechanical Pressure Measuring Device Pressure Gauge1/15/2013
6. 6. Hydrostatic Force on Plane Surface Free Surface Free Surface P=0 P=0 FRh P=γh P=γh Pressure on tank bottom Pressure on tank sides1/15/2013
7. 7. Hydrostatic Force on Plane Surface x y θ FR   hc A Where hc yc FR is the Resultant Force FR hc is the vertical distance from the fluid surface to the centroid of the yR area and A is the area I xc Where yR   yc Ixc is the 2nd moment of the area yc A I xyc xR   xc = Zero in the uniform shape yc A1/15/2013
8. 8. Hydrostatic Force on Plane Surface1/15/2013