+**Fluidity** describes the ability of a substance to flow and change shape under [Stress](/wiki/stress) without permanent deformation. It is a fundamental property of [Liquids](/wiki/liquid) and gases, allowing them to conform to containers and move freely, contrasting with the fixed form of solids.
+## See also
+- [Viscosity](/wiki/viscosity)
+- [Flow](/wiki/flow)
+- [Matter](/wiki/matter)
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