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It is a physical characteristic that is attributed to a material system when it has the same physical properties in all directions, in the sense that if quantities such as electrical and thermal conductivity, expansion, etc. are measured, they do not depend on the direction.
They are isotropes, for example, all gases, liquids and polycrystalline solids, as long as they do not respect this property, and are therefore said anisotropic, monocrystalline solids, for which physical properties often depend on the direction.
Isotropy constitutes one of the fundamental properties of space.