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By definition, a fluid is a material continuum
that is unable to withstand a static shear stress. Unlike an elastic
solid which responds to a shear stress with a recoverable
deformation, a fluid responds with an irrecoverable flow.
Variables needed to define a fluid and its environment are:
Examples of fluids include gases and liquids. Typically, liquids are considered to be incompressible, whereas gases are considered to be compressible. However, there are exceptions in everyday engineering applications. |
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