In physics and electricity, a measure of how easily electric current flows through a material; the reciprocal of electrical resistance.
From 'conduct' (from Latin 'conducere') plus the suffix '-ance' (from Latin '-antia'), which forms nouns from verbs indicating a state, quality, or instance. The electrical meaning developed in the 19th century as the science of electricity advanced.
Conductance is the 'opposite twin' of resistance—if resistance is how much a material blocks electricity, conductance is how eagerly it welcomes electricity; copper has high conductance while rubber has low conductance, which is why copper wires carry power and rubber insulates.
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