o boil the water $($phase change$),$ a wall assembly is suggested as shown below.

Material $1$ is a heater with uniform and constant volumetric heat generation $!.$ The outer surface of the heater

$($Material $1)$ is perfectly insulated. The inner side of the heater is coated with specific paint $($Material $2).$ At the steady

state conditions find the temperature at $=".$

Hint: In boiling $($Thermodynamic phase change$)$ the temperature of the water will remain constant and uniform everywhere

including the surface of the wall, i$.$e$.(="+$# $)=$$$\%$&$\text{'}$&$(!$