	Solid	Gas
Initial Conditions (t = 0)	$T_{s} = T_{a m b}$	$T_{g} = T_{a m b}$
Boundary Cond. (x = 0)	$\frac{\partial T_{s}}{\partial x} = 0$	$T_{g} = T_{i n}$
Boundary Cond. (x = H)	$\frac{\partial T_{s}}{\partial x} = 0$	$\frac{\partial T_{g}}{\partial x} = 0$