Conductivity

noun (uncountable)

/ˌkɒndʌkˈtɪvɪti/

Conductivity is the measure of a material's ability to transmit heat (thermal conductivity), electricity (electrical conductivity), or sound; in electrochemistry, it refers specifically to the ability of an ionic solution to carry electric current, quantified in siemens per metre (S/m). Electrical conductivity is the reciprocal of resistivity (σ = 1/ρ). Water conductivity (measured in µS/cm) is a key indicator of dissolved ionic content and is used to assess water quality in rivers, groundwater, and industrial effluents; India's Central Pollution Control Board (CPCB) uses conductivity as a proxy indicator for Total Dissolved Solids in river water quality monitoring of the Ganga and other rivers under the National Ganga Council framework.

✍️ Usage in a UPSC answer

Real-time electrical conductivity monitoring of Ganga river water at CPCB sensor stations detects industrial effluent discharge events — sudden spikes in conductivity signal elevated dissolved salts and pollutants, triggering enforcement action under the Environment Protection Act, 1986.

Synonyms

electrical conduction (in context)transmissivitypermeanceionic strength (partial)dielectric conductance

Antonyms

resistivityinsulationnon-conductanceimpedance

🌱 Word Family

conduct (verb/noun), conductor (noun), conductive (adjective), conductance (noun), superconductivity (noun), semiconductivity (noun)

🔡 Root

Latin conducere = to lead together, to convey; from con- = together + ducere = to lead; -ivity = noun suffix (state/quality)

📜 Etymology

Formed from the Latin verb conducere (to lead together, to conduct) — composed of con- (together, with) and ducere (to lead) — plus the English suffix -ivity (quality, state). The word 'conduct' (to lead, direct) and 'conductor' share this root, as does 'aqueduct' (aqua + ducere = water-leader). The physical sense of electrical conduction was formalised in the 18th century as scientists studied galvanism, and the measurement concept of conductivity developed with electrochemistry in the 19th century.

🧠 Memory Hook

Conductivity = con- + ducere (to lead together) — a good conductor 'leads electricity together' (through itself) easily. Copper is highly conductive because its electrons are easily led (ducere) across the metal. A bad conductor resists leading — it insulates.

📝 Seen in UPSC Question Papers

Prelims 2012 — Materials Science

Real UPSC previous-year questions whose text uses “Conductivity” — proof this word earns its place on your list.

⚗️ General Science 📖 Seen in: Human Body Systems — Organ Systems, Ph...

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