where T<sub>amb</sub> is the ambient temperature, and h is the coefficient of convective heat transfer having units of W/(m<sup>2</sup>.K).
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The convective boundary condition is a special case of Robin boundary condition:
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<math> \left[ -k \frac{\partial T}{\partial n} + h T(\mathbf{r}) \right]_\Omega = f(\mathbf{r}) </math>
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where Ω is the boundary surface and f(<b>r</b>) is a function.
== The Finite Difference Technique ==