A $5\mathrm{.}5$ mm thick composite panel is insulated all around except for one side where its surface temperature is measured to be $32$C$.$ This exposed side receives radiation from the surroundings which are estimated to be at a blackbody temperature of $38$C$.$ The air blowing over this same exposed surface is at $25$C$.$ Estimate the convection coefficient provided by the air if the emissivity of the exposed panel surface is $0\mathrm{.}85.$