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FLUID MECHANICS Fluid Mechanics is the branch of Engineering Science that is concerned with forces and energies generated by fluids at rest and in motion. Fluid Mechanics plays a very important role not only i n the daily lives of everyone, but in fact throughout the entire domain of nature. The science of fluid mechanics is basic in the design of aircrafts, ships, bridges, buildings, and industrial plants not only from the structural viewpoint but also from the viewpoint of design of basis machinery where such factors as control of fluids, transfer of fluids, power development, lubrication, and fluid pollution control are involved.Fluid is a substance that deforms continuously under the action of an applied shear force or stress. The process of continuous deformation is called flowing. Fluid is a substance that is able to flow. It is divided into liquids and gases, which have many properties that are similar, but certain other properties which are not at all similar. 1.) Liquid are practically incompressible and occupy definite volumes and have free surface. 2.) Gas  are compressible and other must be so treated especially when it expands until it occupies all portions of any containing vessels. UNITS OF MEASUREMENT: Selected R eference Dimensions (Primary).  1. Mass (M) slug, kg, gm 2. Force (F) lbf, N, D 3. Length (L) ft, m, cm 4. Time (T) seconds Note: 1 slug = 14.594 kg. 1 lb = 4.45 N. 1 ft = 0.3048 m. 1 sec. = 1 sec. Secondary Dimensions. 1.  A rea (L 2 ) ft 2 , m 2 , cm 2  2.  Volume(L 3 ) ft 3 , m 3 , cm 3  3.  Velocity   , ,  4.  A cceleration   , ,  5. Pressure or Stress    6. Energy, Heat, Work ft-lbf, N-m , D-cm 7. Power    8. Density    9.  Viscosity    10. Specific Heat     

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