6.2 Determine the thermal conductivity of a test panel 150mm150mm and 12mm thick, if during a two-hour period 8.4104J are conducted through the panel when the two faces are at 290K and 300K. 6.2 Determine the thermal conductivity of a test panel 150mm150mm and 12mm thick, if during a two-hour period 8.4104J are conducted through the panel when the two faces are at 290K and 300K