# Thermal Conductivity Constant

Written by Jerry Ratzlaff on . Posted in Constants

## Thermal Conductivity Constant formula

 $$\large{ k_t = \frac {\dot {Q}_t \; l} {\Delta T} }$$

### Where:

 Units English Metric $$\large{ k_t }$$ = thermal conductivity constant $$\large{\frac{Btu-ft}{hr-ft^2-F}}$$ $$\large{\frac{W}{m-K}}$$ $$\large{ \dot {Q}_t }$$ = heat transfer rate $$\large{\frac{Btu}{hr}}$$ $$\large{W}$$ $$\large{ l }$$ = length $$\large{ft}$$ $$\large{m}$$ $$\large{ \Delta T }$$ = temperature differential $$\large{F}$$ $$\large{K}$$