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Pretty easy, overall.
Fluid mechanics deals with the flow of fluids. Its study is important to physicists, whose main interest is in understanding phenomena. They may, for example, be interested in learning what causes the various types of wave phenomena in the atmosphere and in the ocean. The study or fluid mechanics is just as important to engineers, whose main interest is in the applications of fluid mechanics to solve industrial problems. Aerospace engineers may be interested in designing airplanes that have low resistance and, at the same time, high “lift” force to support the weight of the plane. Civil engineers may be interested in designing irrigation canals, dams, and water supply systems. Pollution control engineers may be interested in saving our planet from the constant dumping of industrial sewage into the atmosphere and the ocean. Mechanical engineers may be interested in designing turbines, heat exchangers, and fluid cooling. Chemical engineers may be interested in designing efficient devices to mix industrial chemicals. The objectives of physicists and engineers, however, are not quite separable because the engineers need to understand and the physicists need to be motivated through applications. Fluid mechanics, like the study of any other branch of science, needs mathematical analyses as well as experimentation.
The analytical approaches help in finding the solutions to certain idealized and simplified problems, and in understanding the unity behind apparently dissimilar phenomena. Needless to say, drastic simplifications are frequently necessary because of the complexity of real phenomena.
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This is an important course for scientists because it deals with the basic elements we know and come in contact on a daily basis.