The unit of thermal conductivity is

The unit of thermal conductivity is

$J m K^{- 1}$
$J m^{- 1} K^{- 1}$
$W m K^{- 1}$
$W m^{- 1} K^{- 1}$

Solution

\frac{∆ Q}{∆ t} = K A \frac{∆ T}{∆ l}

K = \frac{∆ Q}{∆ t} \frac{∆ l}{∆ T} \frac{1}{A}

∴

Unit of

K

is

W m^{- 1} K^{- 1}

Asked in: NEET 2019 (All India)

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