# Question #274e9

Sep 9, 2017

Thermal conductivity will not change.

#### Explanation:

Thermal conductivity is an intensive property of a substance i.e. it does not depends upon shape, size or quantity of the substance.
Hence thermal conductivity will not change.
However its thermal resistance will change as thermal resistance is given by......
$R = \frac{l}{k A}$
Where $R$: Thermal resistance
$l$: length of the heat conducting body
$k$: Thermal conductivity of the substance
$A$: cross sectional area of the conductor
Hence if the thickness of the wall is doubled and heat has to flow along its thickness then in our equation $l$ is doubled so it's thermal resistance will get doubled but its thermal conductivity will not change.