The unit of thermal conductivity is

Options

(a) Wm⁻¹K⁻¹
(b) JK⁻¹
(c) WmK
(d) JK

Correct Answer:

Wm⁻¹K⁻¹

Explanation:

The heat current related to difference of temperature across the length l of a conductor of area A is
dH/dt = KA / ℓ ∆T (K=Coefficient of thermal conductivity)
.·. K = ℓ dH / A dt ∆T
Unit of K = W m⁻¹ K⁻¹.