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'''Fluid mechanics''' is the study of the motion of fluids and the forces that leads to these motions. It can be further classified into two categories: fluid statics (studies of fluids at rest) and fluid dynamics (studies of fluids in motion). The "fluid" in the term fluid mechanics is defined <ref>James R. Welty, Charles E. Wicks, Robert E. Wilson, and Gregory L. Rorrer, Fundamentals of Momentum, Heat, and Mass Transfer, 4th Ed. Toronto: John Wiley & Sons Inc, 2001.</ref> to be "a substance which deforms continuously under the action of a shear stress", which includes both liquids and gases.