$\huge \begin{align} \pderiv{Q}{t} &= A \kappa \frac{\Delta T}{\ell} \\ &= \frac{A}{R} \Delta T \end{align}$ Where: - $\kappa$ denotes the *Thermal Conductivity* of the material. - $A$ is the cross sectional [[Area]] of the object - $\ell$ is the distance in which heat is transferred.