Introduction to Fluid Mechanics
Everyone is familiar with matter in the fluid state such as air, water, or oil. The most obvious attribute of a fluid is its capability of flowing. Fluids can travel down slope like water in a river or crude oil flowing along pipes; they give rise to currents in the presence of a pressure gradient, such as wind created by pressure differences in the atmosphere. Fluid mechanics, the science of fluids, is crucial not only in science, but also in engineering problems like the flight of an aircraft and the lubrication of joints in an engine. Fluid mechanics is a complicated and varied subject where new experiments and theoretical calculations are constantly reported by scientists and engineers. This is testified by the numerous (in the number of some hundreds) original papers appearing monthly on specialized journals.