Introduction

• Fluid is a matter in a state which can flow. Liquids, gases, molten metal and tar are examples of fluids.

• Fluid mechanics is studied in two parts:

( i ) Fluid statics - Study of the forces and pressures acting on stationary fluid. Pascal’s law and Archimedes’ principle and surface tension are discussed in

fluid statics.
( ii ) Fluid dynamics - Study of motion of fluid and properties related to it as a result of

forces acting on fluid. Bernoulli’s theorem and its applications and viscosity of fluid are discussed here. Fluid dynamics is studied in two sections: Hydrodynamics and Aerodynamics.