Question

SI unit of thermal conductivity is

Answer 1

SI unit of thermal conductivity

1. The capacity of a material to transport thermal energy or heat energy via itself is known as thermal conductivity. It is denoted by $k$.
2. Heat moves from one conductor face to another as a result of temperature difference.
3. The expression for thermal conductivity is given as $k=\frac{Q·L}{A·△T}$, where, $Q$ denotes the amount of heat energy that can be transferred through the given material in the units of power, $L$ represents the length of the conductor, $A$represents the area of cross-section of the conductor and $△T$ represents the temperature difference between the two ends of the conductor.
4. In SI system, unit of $Q$ is Watt denotes as $W$, unit of $L$ is Meter denoted as $m$, unit of $A$ is square meter denoted as $m^2$, unit of $△T$ is Kelvin denoted as $K$. Therefore, the SI unit of thermal conductivity is $\frac{Wm}{m^{2}K}\Rightarrow \frac{W}{mK}$ i.e. Watt per meter Kelvin.

Hence the SI unit of thermal conductivity is Watt per meter Kelvin.