+Fluids are substances that continuously deform when subjected to a tangential, or [shear](/wiki/shear), stress. Unlike [solids](/wiki/solid), they have no fixed shape, taking on the form of their container, encompassing both [liquids](/wiki/liquid) and [gases](/wiki/gas).
+## See also
+- [Hydrodynamics](/wiki/hydrodynamics)
+- [Aerodynamics](/wiki/aerodynamics)
+- [Viscosity](/wiki/viscosity)
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