While the motion of rigid bodies is rather uninteresting, the motion of fluids observed in nature can indeed be pleasing to the eye. The flow of a gurgling stream, the eruption of molten lava, the swirl of hot gases from a burning tinder, ocean waves – all these and more are the subject of fluid dynamics. While each particle of the fluid follows Newton's laws of motion, we find it convenient to describe the properties of the fluid at each point on its path as a function of time. The motion of a real fluid is complex and not yet fully understood. Therefore, we often make matters simple by assuming an ideal fluid which is non-viscous and incompressible. Further, the flow of the ideal fluid is assumed to be steady and irrotational. However, in the latter part of the topic, we discuss viscosity and steady flow of a viscous fluid. The students will acquire a commanding grip on the topic and will learn to solve a variety of problems – simple to moderate to difficult – through a series of video lectures titled Equation of Continuity, Bernoulli's Equation, Some Applications of Bernoulli's Equation, Viscosity, Poiseuille's Law, Critical Speed and Reynolds Number, Motion of a Solid Body in a Viscous Fluid, et cetera.
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