watt per metre kelvin

Name	Symbol	Quantity	Base units
watt per metre kelvin	W/(m K)	thermal conductivity	kg m s⁻³ K⁻¹
The watt per metre kelvin, symbol W/(m K), is the SI coherent derived unit of thermal conductivity.
Definition			c^-1 Δν_Cs² k
$1 \mspace{4mu} \text{W} / (\text{m} \mspace{4mu} \text{K}) \mspace{6mu} = \dfrac{299 \mspace{4mu} 792 \mspace{4mu} 458}{(9 \mspace{4mu} 192 \mspace{4mu} 631 \mspace{4mu} 770)^2(1.380 \mspace{4mu} 649 \times 10^{-23})} \mspace{6mu} \dfrac{{\Delta \nu _{Cs}}^2 \mspace{4mu} k}{c}\\ \\ \\ 1 \mspace{4mu} \text{W} / (\text{m} \mspace{4mu} \text{K}) \mspace{6mu} \approx 2.569 \mspace{4mu} 553 \mspace{4mu} 665 \mspace{4mu} 732 \mspace{4mu} 917 \mspace{4mu} 340 \times10^{11} \mspace{6mu} c^{-1} \mspace{4mu} {\Delta \nu _{Cs}}^2 \mspace{4mu} k$