Plural form of conductivity; multiple measures or instances of how well different materials conduct electricity, heat, or other forms of energy.
From 'conductivity' (from 'conductive' plus '-ity,' a suffix forming abstract nouns) plus the plural suffix '-ies.' In technical contexts, scientists discuss multiple materials' conductivities simultaneously.
When materials scientists compare the 'conductivities' of different metals, they're ranked on a numerical scale—silver tops the list, followed by copper, gold, and aluminum, which is why copper became the wiring standard despite silver being better!
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