The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at, where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be________________?

Correct answer: D. W/m.k2

A. W/m.k
B. W/m
C. None, 'a' is just a number
D. W/m.k2

Explanation

Since K has units W/(m·K) and T has units K, the coefficient a in K = K0 + aT must have units W/(m·K²).

Written and checked by Zahid Hussain, MS Computer ScienceLast updated 18 September 2026

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