15. A new type of insulating board has been developed by that esteemed construction organisation Kaput Co. They warn that at extremely high heat fluxes it could be ignited, but

they don't think it's very likely and it would take hours, so there's no real risk!As an expert on the ignitability of materials, you are asked to perform a thick/thin calculation given the following data on the material: Density 2300kg m3 Thermal conductivity 0.85W m-1 K-1 Specific heat capacity 847J kg1 K1 Thickness of board 8mm Initial/ambient laboratory temperature18°C Ignition temperature 415°C