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Conductivity is the material's ability to conduct electricity. It describes how easily electric current can flow through a substance, depending on how many free charge carriers are available and how freely they can move. Metals have many free electrons, so they typically have high conductivity, while insulators have few mobile charge carriers and low conductivity. Conductivity is the inverse of resistivity, and it’s measured in siemens per meter. The other terms refer to different ideas: a bond is a chemical connection between atoms, cross-linked describes a network structure in polymers that affects mechanical properties, and a compliance violation is an unrelated legal term.